Add compatibility to PHP 8

.travis.yml

@@ -30,6 +30,9 @@ matrix:
     - php: 7.2
     - php: 7.3
     - php: 7.4
+    - php: nightly
+      env:
+        - COMPOSER_DEV_STABILITY=true
 
 before_install:
   - sudo add-apt-repository ppa:mc3man/trusty-media -y
@@ -46,6 +49,10 @@ before_install:
     if [ "$COMPOSER_FLAGS" == "--prefer-lowest" ]; then
       composer require "roave/security-advisories" dev-master --no-update
     fi;
+  - |
+    if [ "$COMPOSER_DEV_STABILITY" == "true" ]; then
+      composer config minimum-stability dev
+    fi;
 
 install:
   - sudo apt-get install -y ffmpeg

composer.json

@@ -32,7 +32,7 @@
         }
     ],
     "require": {
-        "php": "^5.3.9 || ^7.0",
+        "php": ">=5.3.9",
         "alchemy/binary-driver": "^1.5 || ~2.0.0 || ^5.0",
         "doctrine/cache": "^1.0",
         "evenement/evenement": "^3.0 || ^2.0 || ^1.0",
@@ -58,7 +58,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.7-dev"
+            "dev-master": "0.x-dev"
         }
     }
 }