Merge pull request #40 from friends-of-phpspec/ci/fix-worflow-for-433

Force composer v1 because of compatibility issues.

Author: shulard

.github/workflows/continuous-integration.yml

@@ -15,6 +15,7 @@ jobs:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macOS-latest]
         php-versions: ['7.1', '7.2', '7.3', '7.4']
+        composer-versions: ['composer:v1']
 
     steps:
       - name: Set git to use LF
@@ -31,6 +32,7 @@ jobs:
         uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php-versions }}
+          tools: ${{ matrix.composer-versions }}
           extensions: mbstring,xdebug,pcov
 
       - name: Get Composer Cache Directory