build: fix repository.url in package.json (#334)

Author: dsanders11

package.json

@@ -18,7 +18,7 @@
   "homepage": "https://github.com/electron/asar",
   "repository": {
     "type": "git",
-    "url": "https://github.com/electron/asar.git"
+    "url": "git+https://github.com/electron/asar.git"
   },
   "bugs": {
     "url": "https://github.com/electron/asar/issues"