Support PHP 7.4 (#15)

This makes it possible to run PHPStan with this error formatter on projects that need PHP 7.

Author: ruudk

.github/workflows/ci.yaml

@@ -14,7 +14,13 @@ jobs:
         strategy:
             fail-fast: false
             matrix:
-                php: [ '8.1', '8.2', '8.3', '8.4' ]
+                php:
+                    - '7.4'
+                    - '8.0'
+                    - '8.1'
+                    - '8.2'
+                    - '8.3'
+                    - '8.4'
                 dependency-versions: [ lowest, highest ]
         steps:
             -   name: Checkout
@@ -36,20 +42,23 @@ jobs:
 
     phpstan:
         runs-on: ubuntu-latest
-
+        strategy:
+            fail-fast: false
+            matrix:
+                php:
+                    - '7.4'
+                    - '8.3'
         steps:
             -   name: Checkout code
                 uses: actions/checkout@v4
 
             -   name: Set up PHP
                 uses: shivammathur/setup-php@v2
                 with:
-                    php-version: '8.1'
+                    php-version: '${{ matrix.php }}'
 
             -   name: Install Composer packages
                 uses: ramsey/composer-install@v3
-                with:
-                    dependency-versions: '${{ matrix.dependency-versions }}'
 
             -   name: Run PHPStan
                 run: vendor/bin/phpstan --ansi

composer.json

@@ -4,7 +4,7 @@
     "keywords": ["phpstan", "dev"],
     "type": "phpstan-extension",
     "require": {
-        "php": "^8.1",
+        "php": "^7.4|^8.0",
         "phpstan/phpstan": "^1.12.4"
     },
     "license": "MIT",
@@ -26,9 +26,12 @@
         }
     },
     "config": {
-        "sort-packages": true
+        "sort-packages": true,
+        "platform": {
+            "php": "7.4"
+        }
     },
     "require-dev": {
-        "phpunit/phpunit": "^10.5.35"
+        "phpunit/phpunit": "^9.6"
     }
 }