Bump rspec from 3.12.0 to 3.13.0

Bumps [rspec](https://github.com/rspec/rspec-metagem) from 3.12.0 to 3.13.0.
- [Commits](rspec/rspec-metagem@v3.12.0...v3.13.0)

---
updated-dependencies:
- dependency-name: rspec
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
  codeclimate-test-reporter (0.4.1)
  simplecov (>= 0.7.1, < 1.0.0)
  coderay (1.1.2)
- diff-lcs (1.5.0)
+ diff-lcs (1.5.1)
  docile (1.1.5)
  ffi (1.15.5)
  inch (0.8.0)
@@ -46,19 +46,19 @@ GEM
  ffi (>= 0.5.0)
  rb-kqueue (0.2.3)
  ffi (>= 0.5.0)
- rspec (3.12.0)
- rspec-core (~> 3.12.0)
- rspec-expectations (~> 3.12.0)
- rspec-mocks (~> 3.12.0)
- rspec-core (3.12.0)
- rspec-support (~> 3.12.0)
- rspec-expectations (3.12.0)
+ rspec (3.13.0)
+ rspec-core (~> 3.13.0)
+ rspec-expectations (~> 3.13.0)
+ rspec-mocks (~> 3.13.0)
+ rspec-core (3.13.0)
+ rspec-support (~> 3.13.0)
+ rspec-expectations (3.13.0)
  diff-lcs (>= 1.2.0, < 2.0)
- rspec-support (~> 3.12.0)
- rspec-mocks (3.12.0)
+ rspec-support (~> 3.13.0)
+ rspec-mocks (3.13.0)
  diff-lcs (>= 1.2.0, < 2.0)
- rspec-support (~> 3.12.0)
- rspec-support (3.12.0)
+ rspec-support (~> 3.13.0)
+ rspec-support (3.13.0)
  rubocop (0.49.1)
  parallel (~> 1.10)
  parser (>= 2.3.3.1, < 3.0)