Add npm-shrinkwrap.json to npm

Reviewed By: svcscm

Differential Revision: D2933826

fb-gh-sync-id: 48def92bfd9eb929cc092bea90bcbe1ed53f8675
shipit-source-id: 48def92bfd9eb929cc092bea90bcbe1ed53f8675

Author: skevy

package.json

@@ -92,7 +92,8 @@
     "PATENTS",
     "README.md",
     "jestSupport",
-    ".flowconfig"
+    ".flowconfig",
+    "npm-shrinkwrap.json"
   ],
   "scripts": {
     "test": "NODE_ENV=test jest",