Merge pull request #198 from kenjis/fix-github-actions

Update GitHub Actions for 5.x

.github/workflows/continuous-integration.yml

@@ -15,13 +15,7 @@ jobs:
         operating-system:
           - ubuntu-latest
         php-version:
-          - '5.6'
-          - '7.0'
-          - '7.1'
-          - '7.2'
-          - '7.3'
-          - '7.4'
-          - '8.0'
+          - '8.1'
     steps:
       - name: Checkout
         uses: actions/checkout@v1
@@ -45,12 +39,7 @@ jobs:
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
-      - name: Install dependencies (5.6 and 7.x)
-        if: ${{ matrix.php-version != '8.0' }}
-        run: composer install --no-interaction --prefer-dist
-
-      - name: Install dependencies (8.0)
-        if: ${{ matrix.php-version == '8.0' }}
+      - name: Install dependencies
         run: composer install --no-interaction --prefer-dist --ignore-platform-req=php
 
       - name: Run test suite