Enable pcov for GH workflows/ci.yml

Author: Florian Krämer

.github/workflows/ci.yml

@@ -21,8 +21,8 @@ jobs:
  with:
  php-version: '7.4'
  extensions: mbstring, json, fileinfo
- coverage: none
  tools: pecl
+ coverage: pcov
 
  - name: Composer install
  run: |