chore: correct package json

Author: JulianLang

package.json

@@ -54,7 +54,7 @@
   ],
   "repository": {
     "type": "git",
-    "url": "https://github.com/Centigrade/ngtx.git"
+    "url": "git+https://github.com/Centigrade/ngtx.git"
   },
   "author": "Julian Lang <julian.lang@centigrade.de>",
   "license": "MIT"