Remove old workflow

.github/workflows/build.yaml

@@ -1,42 +0,0 @@
-name: build
-on:
-  pull_request:
-  push:
-jobs:
-  run:
-    runs-on: ${{ matrix.operating-system }}
-    strategy:
-      matrix:
-        operating-system: [ubuntu-latest, windows-latest, macos-latest]
-        php-versions: ['7.1', '7.2', '7.3', '7.4']
-    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
-    steps:
-    - name: Checkout
-      uses: actions/checkout@v2
-
-    - name: Setup PHP
-      uses: shivammathur/setup-php@v2
-      with:
-        php-version: ${{ matrix.php-versions }}
-        extensions: mbstring, intl
-        coverage: xdebug        
-
-    - name: Check environment
-      run: |
-        php --version
-        composer --version
-
-    - name: Install dependencies
-      run: composer update -n --prefer-dist
-
-    - name: Run tests
-      run: |
-        vendor/bin/phpunit --coverage-text --coverage-clover build/logs/clover.xml
-        PHP_CS_FIXER_IGNORE_ENV=1 php vendor/bin/php-cs-fixer --diff --dry-run -v fix
-        vendor/bin/psalm
-
-    - name: Collect code coverage
-      env:
-        COVERALLS_REPO_TOKEN: ${{secrets.GITHUB_TOKEN}}
-      if: success()
-      run: vendor/bin/coveralls build/logs/clover.xml