Update workflow

.github/workflows/CI.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        php-versions: ['7.2', '7.3', '7.4']
+        php-versions: ['7.3', '7.4', '8.0']
       fail-fast: false
     steps:
       - uses: actions/checkout@v2
@@ -16,22 +16,44 @@ jobs:
           php-version: ${{ matrix.php-versions }}
           extensions: gd, mbstring, pcov, zip
           ini-values: max_execution_time=600, memory_limit=-1
-      - name: Install dependencies
+          tools: composer:v2
+          coverage: pcov
+        env:
+          COMPOSER_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Get composer cache directory
+        id: composercache
+        run: echo "::set-output name=dir::$(composer config cache-files-dir)"
+
+      - name: Cache composer dependencies
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.composercache.outputs.dir }}
+          key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
+          restore-keys: ${{ runner.os }}-composer-
+
+      - name: Setup problem matchers
         run: |
-          curl -sS https://getcomposer.org/installer | php -- --filename=composer
-          ./composer install
+          echo "::add-matcher::${{ runner.tool_cache }}/php.json"
+          echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+      - name: Install Composer dependencies
+        run: composer install --prefer-dist
+
       - name: Check code quality
-        run: |
-          vendor/bin/code-quality
+        run: vendor/bin/code-quality
+
       - name: Test against highest versions
         run: |
           vendor/bin/unit-test
           vendor/bin/functional-test
+
       - name: Test against lowest versions
         run: |
-          ./composer update --prefer-lowest
+          composer update --prefer-lowest
           vendor/bin/unit-test
-          vendor/bin/functional-test ^4.4
+          vendor/bin/functional-test ^3.4
+
       - name: Archive code coverage results
         uses: actions/upload-artifact@v2
         with:

composer.json

@@ -12,15 +12,15 @@
         }
     ],
     "require": {
-        "php": ">=7.2",
+        "php": "^7.3||^8.0",
         "bacon/bacon-qr-code": "^2.0",
         "khanamiryan/qrcode-detector-decoder": "^1.0.2",
+        "myclabs/php-enum": "^1.5",
         "symfony/options-resolver": "^3.4||^4.4||^5.0",
-        "symfony/property-access": "^3.4||^4.4||^5.0",
-        "myclabs/php-enum": "^1.5"
+        "symfony/property-access": "^3.4||^4.4||^5.0"
     },
     "require-dev": {
-        "endroid/quality": "^1.3.7",
+        "endroid/quality": "^1.5.1",
         "setasign/fpdf": "^1.8"
     },
     "suggest": {