set repository name as the git form

Author: rgbkrk

package.json

@@ -39,7 +39,7 @@
     "precommit": "lint-staged"
   },
   "atomTestRunner": "atom-jasmine3-test-runner",
-  "repository": "https://github.com/nteract/hydrogen",
+  "repository": "git@github.com:nteract/hydrogen.git",
   "license": "MIT",
   "engines": {
     "atom": ">=1.20.0 <2.0.0"