Add shellcheck plugin

Author: IanDelMar

.codeclimate.yml

@@ -28,11 +28,12 @@ plugins:
  enabled: false
  CleanCode/ElseExpression:
  enabled: false
+ shellcheck:
+ enabled: true
 exclude_patterns:
  - "**.dist"
  - "**.lock"
  - "**.json"
- - "**.sh"
  - "**.txt"
  - "tests/*"
  - "vendor/**"