allow installation on PHP 8

Author: xabbuh

.github/workflows/ci.yaml

@@ -21,6 +21,10 @@ jobs:
             composer-options: '--prefer-stable'
           - php-version: '7.3'
             composer-options: '--prefer-stable'
+          - php-version: '7.4'
+            composer-options: '--prefer-stable'
+          - php-version: '8.0'
+            composer-options: '--prefer-stable'
 
     steps:
       - name: 'Check out'

composer.json

@@ -12,7 +12,7 @@
         }
     ],
     "require": {
-        "php": "^7.1",
+        "php": "^7.1||^8.0",
         "php-http/client-common": "^1.0 || ^2.0",
         "php-http/client-implementation": "^1.0",
         "php-http/httplug": "^1.0 || ^2.0",
@@ -52,7 +52,7 @@
     },
     "extra": {
         "branch-alias": {
-            "dev-master": "0.7.x-dev"
+            "dev-master": "0.8.x-dev"
         }
     }
 }