disable greenkeeper for the electron stack. Fixes #1017

Summary: Updating Electron is an expensive call (in terms of time investment), and potentially very impactful in a way that is hard to test automated. So should be done consciously rather than for every random patch that appears.

Reviewed By: jknoxville

Differential Revision: D21134157

fbshipit-source-id: 9d208cffa84728aead620d0ec6a6cd1f01f01e2d

desktop/package.json

@@ -233,5 +233,12 @@
   },
   "optionalDependencies": {
     "7zip-bin-mac": "^1.0.1"
+  },
+  "greenkeeper": {
+    "ignore": [
+      "electron",
+      "electron-builder",
+      "@jest-runner/electron"
+    ]
   }
 }