Remove PHPStorm stubs repository reference

composer.json

@@ -8,23 +8,5 @@
         "parse-stubs": "LanguageServer\\ComposerScripts::parseStubs",
         "post-update-cmd": "@parse-stubs",
         "post-install-cmd": "@parse-stubs"
-    },
+    }
-    "repositories": [
-        {
-            "type": "package",
-            "package": {
-                "name": "JetBrains/phpstorm-stubs",
-                "version": "dev-master",
-                "dist": {
-                    "url": "https://github.com/JetBrains/phpstorm-stubs/archive/master.zip",
-                    "type": "zip"
-                },
-                "source": {
-                    "url": "https://github.com/JetBrains/phpstorm-stubs",
-                    "type": "git",
-                    "reference": "master"
-                }
-            }
-        }
-    ]
 }