Temporarily fix https://www.npmjs.com/advisories/803

Once `node-gyp` issues a release, we can back this out and update. The version number for that will likely be `3.8.1`

More info at: nodejs/node-gyp#1713

package.json

@@ -15,7 +15,7 @@
     "commander": "^2.15.1",
     "cppunitlite": "brave/CppUnitLite",
     "mocha": "^5.2.0",
-    "node-gyp": "^3.8.0",
+    "node-gyp": "github:brave/node-gyp",
     "pre-commit": "^1.2.2",
     "s3-client": "^4.4.2",
     "standard": "^11.0.1"