Remove old PHP versions from CI

.github/workflows/ci.yml

@@ -3,44 +3,13 @@ name: CI
 on: [push]
 
 jobs:
-  old:
-    name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
-    runs-on: ${{ matrix.operating-system }}
-    strategy:
-      matrix:
-        operating-system: ['ubuntu-16.04']
-        php-versions: ['7.0']
-        phpunit-versions: ['7.5.20']
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Setup PHP
-        uses: shivammathur/setup-php@v2
-        with:
-          php-version: ${{ matrix.php-versions }}
-          extensions: mbstring, intl
-          ini-values: post_max_size=256M, max_execution_time=180
-          tools: psalm, phpunit:${{ matrix.phpunit-versions }}
-
-      - name: Fix permissions
-        run: sudo chmod -R 0777 .
-
-      - name: Install dependencies
-        run: composer self-update --1; composer install
-
-      - name: PHPUnit tests
-        uses: php-actions/phpunit@v2
-        with:
-          memory_limit: 256M
-
   moderate:
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     runs-on: ${{ matrix.operating-system }}
     strategy:
       matrix:
         operating-system: ['ubuntu-latest']
-        php-versions: ['7.1', '7.2', '7.3']
+        php-versions: ['7.3']
         phpunit-versions: ['latest']
     steps:
       - name: Checkout