Dropped branch alias in composer.json (#23)

Author: yann-eugone

composer.json

@@ -32,12 +32,5 @@
   "require-dev": {
     "phpunit/phpunit": "^7.5",
     "squizlabs/php_codesniffer": "^3.5"
-  },
-  "minimum-stability": "stable",
-  "extra": {
-    "branch-alias": {
-      "dev-0.x": "0.4.x-dev",
-      "dev-0.3": "0.3.x-dev"
-    }
   }
 }