Add support for PHP 7.4 and 8.0 (#134)

Author: pamil

.travis.yml

@@ -11,24 +11,27 @@ matrix:
     fast_finish: true
     include:
           # Minimum supported Symfony version with the latest PHP version
-        - php: 7.3
+        - php: 7.4
           env: COMPOSER_FLAGS="--prefer-stable --prefer-lowest"
 
           # Test the latest stable release
         - php: 7.2
         - php: 7.3
+        - php: 7.4
           env: COVERAGE=true PHPUNIT_FLAGS="-v --coverage-text"
 
           # Force some major versions of Symfony
-        - php: 7.3
+        - php: 7.4
           env: DEPENDENCIES="dunglas/symfony-lock:^3"
-        - php: 7.3
+        - php: 7.4
           env: DEPENDENCIES="dunglas/symfony-lock:^4"
 
           # Latest commit to master
-        - php: 7.3
+        - php: 7.4
           env: STABILITY="dev"
 
+        - php: 8.0snapshot
+
     allow_failures:
           # Dev-master is allowed to fail.
         - env: STABILITY="dev"

composer.json

@@ -13,7 +13,7 @@
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": "^7.2 || ^8.0",
         "matthiasnoback/symfony-config-test": "^4.0.1",
         "symfony/dependency-injection": "^3.4 || ^4.4 || ^5.0",
         "symfony/config": "^3.4 || ^4.4 || ^5.0",