codecov: add threshold values

Adds desired targets and threshold values for code coverage tests in
pull requests.

Removes custom code coverage range to fall back to codecov defaults.

.github/codecov.yml

@@ -1,20 +1,26 @@
 codecov:
-  require_ci_to_pass: yes
+ require_ci_to_pass: yes
 
 coverage:
- precision: 2
- round: down
- range: "80...100"
+ status:
+ patch:
+ default:
+ informational: true
+ project:
+ default:
+ base: auto
+ target: auto
+ threshold: 2%
 
 parsers:
-  gcov:
-  branch_detection:
-  conditional: yes
-  loop: yes
-  method: no
-  macro: no
+ gcov:
+ branch_detection:
+ conditional: yes
+ loop: yes
+ method: no
+ macro: no
 
 comment:
-  layout: "reach,diff,flags,tree"
-  behavior: default
-  require_changes: no
+ layout: "reach,diff,flags,tree"
+ behavior: default
+ require_changes: no