Update composer.json

Author: georgique

composer.json

@@ -9,17 +9,9 @@
       "email": "[email protected]"
     }
   ],
-  "require": {
-    "yiisoft/yii2": ">=2.0.6"
-  },
   "autoload": {
     "psr-4": {
       "georgique\\yii2\\jsonrpc\\": ""
     }
-  },
-  "extra": {
-    "branch-alias": {
-      "dev-master": "1.0.x-dev"
-    }
   }
 }