diff --git a/Pipfile.lock b/Pipfile.lock
index f5be7da..91742a3 100644
--- a/Pipfile.lock
+++ b/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "8c45cd4fef47bf79225773acb1db2d4aadc400a1db629f7884a7514499de4cf6"
         },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.2",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "4.13.3-1-ARCH",
-            "platform_system": "Linux",
-            "platform_version": "#1 SMP PREEMPT Thu Sep 21 20:33:16 CEST 2017",
-            "python_full_version": "3.6.2",
-            "python_version": "3.6",
-            "sys_platform": "linux"
-        },
         "pipfile-spec": 6,
         "requires": {},
         "sources": [
@@ -35,132 +22,132 @@
         },
         "pytz": {
             "hashes": [
-                "sha256:c883c2d6670042c7bc1688645cac73dd2b03193d1f7a6847b6154e96890be06d",
-                "sha256:03c9962afe00e503e2d96abab4e8998a0f84d4230fa57afe1e0528473698cdd9",
-                "sha256:487e7d50710661116325747a9cd1744d3323f8e49748e287bc9e659060ec6bf9",
-                "sha256:43f52d4c6a0be301d53ebd867de05e2926c35728b3260157d274635a0a947f1c",
-                "sha256:d1d6729c85acea5423671382868627129432fba9a89ecbb248d8d1c7a9f01c67",
-                "sha256:54a935085f7bf101f86b2aff75bd9672b435f51c3339db2ff616e66845f2b8f9",
-                "sha256:39504670abb5dae77f56f8eb63823937ce727d7cdd0088e6909e6dcac0f89043",
-                "sha256:ddc93b6d41cfb81266a27d23a79e13805d4a5521032b512643af8729041a81b4",
-                "sha256:f5c056e8f62d45ba8215e5cb8f50dfccb198b4b9fbea8500674f3443e4689589"
-            ],
-            "version": "==2017.2"
+                "sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da",
+                "sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798"
+            ],
+            "version": "==2021.1"
         }
     },
     "develop": {
         "alabaster": {
             "hashes": [
-                "sha256:2eef172f44e8d301d25aff8068fddd65f767a3f04b5f15b0f4922f113aa1c732",
-                "sha256:37cdcb9e9954ed60912ebc1ca12a9d12178c26637abdf124e3cde2341c257fe0"
+                "sha256:446438bdcca0e05bd45ea2de1668c1d9b032e1a9154c2c259092d77031ddd359",
+                "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"
             ],
-            "version": "==0.7.10"
+            "version": "==0.7.12"
         },
         "babel": {
             "hashes": [
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-                "sha256:6007daf714d0cd5524bbe436e2d42b3c20e68da66289559341e48d2cd6d25811"
+                "sha256:9d35c22fcc79893c3ecc85ac4a56cde1ecf3f19c540bba0922308a6c06ca6fa5",
+                "sha256:da031ab54472314f210b0adcff1588ee5d1d1d0ba4dbd07b94dba82bde791e05"
             ],
-            "version": "==2.5.1"
+            "version": "==2.9.0"
         },
         "certifi": {
             "hashes": [
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-                "sha256:40523d2efb60523e113b44602298f0960e900388cf3bb6043f645cf57ea9e3f5"
+                "sha256:1a4995114262bffbc2413b159f2a1a480c969de6e6eb13ee966d470af86af59c",
+                "sha256:719a74fb9e33b9bd44cc7f3a8d94bc35e4049deebe19ba7d8e108280cfd59830"
             ],
-            "version": "==2017.7.27.1"
+            "version": "==2020.12.5"
         },
         "chardet": {
             "hashes": [
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-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
+                "sha256:0d6f53a15db4120f2b08c94f11e7d93d2c911ee118b6b30a04ec3ee8310179fa",
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-            "version": "==3.0.4"
+            "version": "==4.0.0"
         },
         "coverage": {
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-            "version": "==4.4.1"
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+                "sha256:c0891a6a97b09c1f3e073a890514d5012eb256845c451bd48f7968ef939bf4ae",
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+                "sha256:d1f8bf7b90ba55699b3a5e44930e93ff0189aa27186e96071fac7dd0d06a1873",
+                "sha256:d1f9ce122f83b2305592c11d64f181b87153fc2c2bbd3bb4a3dde8303cfb1a6b",
+                "sha256:d314ed732c25d29775e84a960c3c60808b682c08d86602ec2c3008e1202e3bb6",
+                "sha256:d636598c8305e1f90b439dbf4f66437de4a5e3c31fdf47ad29542478c8508bbb",
+                "sha256:deee1077aae10d8fa88cb02c845cfba9b62c55e1183f52f6ae6a2df6a2187160",
+                "sha256:ebe78fe9a0e874362175b02371bdfbee64d8edc42a044253ddf4ee7d3c15212c",
+                "sha256:f030f8873312a16414c0d8e1a1ddff2d3235655a2174e3648b4fa66b3f2f1079",
+                "sha256:f0b278ce10936db1a37e6954e15a3730bea96a0997c26d7fee88e6c396c2086d",
+                "sha256:f11642dddbb0253cc8853254301b51390ba0081750a8ac03f20ea8103f0c56b6"
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+            "version": "==5.5"
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         "decorator": {
             "hashes": [
-                "sha256:95a26b17806e284452bfd97fa20aa1e8cb4ee23542bda4dbac5e4562aa1642cd",
-                "sha256:7cb64d38cb8002971710c8899fbdfb859a23a364b7c99dab19d1f719c2ba16b5"
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             ],
-            "version": "==4.1.2"
+            "version": "==5.0.7"
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         "docutils": {
             "hashes": [
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+                "sha256:cf316c8370a737a022b72b56874f6602acf974a37a9fba42ec2876387549fc61"
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-            "version": "==0.14"
+            "version": "==0.17.1"
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         "flake8": {
             "hashes": [
-                "sha256:f1a9d8886a9cbefb52485f4f4c770832c7fb569c084a9a314fb1eaa37c0c2c86",
-                "sha256:c20044779ff848f67f89c56a0e4624c04298cd476e25253ac0c36f910a1a11d8"
+                "sha256:c20044779ff848f67f89c56a0e4624c04298cd476e25253ac0c36f910a1a11d8",
+                "sha256:f1a9d8886a9cbefb52485f4f4c770832c7fb569c084a9a314fb1eaa37c0c2c86"
             ],
             "version": "==3.4.1"
         },
         "idna": {
             "hashes": [
-                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4",
-                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f"
+                "sha256:b307872f855b18632ce0c21c5e45be78c0ea7ae4c15c828c20788b26921eb3f6",
+                "sha256:b97d804b1e9b523befed77c48dacec60e6dcb0b5391d57af6a65a312a90648c0"
             ],
-            "version": "==2.6"
+            "version": "==2.10"
         },
         "imagesize": {
             "hashes": [
-                "sha256:6ebdc9e0ad188f9d1b2cdd9bc59cbe42bf931875e829e7a595e6b3abdc05cdfb",
-                "sha256:0ab2c62b87987e3252f89d30b7cedbec12a01af9274af9ffa48108f2c13c6062"
+                "sha256:6965f19a6a2039c7d48bca7dba2473069ff854c36ae6f19d2cde309d998228a1",
+                "sha256:b1f6b5a4eab1f73479a50fb79fcf729514a900c341d8503d62a62dbc4127a2b1"
             ],
-            "version": "==0.7.1"
+            "version": "==1.2.0"
         },
         "ipdb": {
             "hashes": [
@@ -170,8 +157,8 @@
         },
         "ipython": {
             "hashes": [
-                "sha256:fcc6d46f08c3c4de7b15ae1c426e15be1b7932bcda9d83ce1a4304e8c1129df3",
-                "sha256:51c158a6c8b899898d1c91c6b51a34110196815cc905f9be0fa5878e19355608"
+                "sha256:51c158a6c8b899898d1c91c6b51a34110196815cc905f9be0fa5878e19355608",
+                "sha256:fcc6d46f08c3c4de7b15ae1c426e15be1b7932bcda9d83ce1a4304e8c1129df3"
             ],
             "version": "==6.2.1"
         },
@@ -184,23 +171,74 @@
         },
         "jedi": {
             "hashes": [
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@@ -211,87 +249,87 @@
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@@ -310,31 +348,24 @@
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@@ -344,17 +375,17 @@
         },
         "six": {
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@@ -365,57 +396,64 @@
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