Make sure sdks/.hermesversion is included inside the NPM package.

Summary:
The sdks/.hermesversion file should be included inside the React Native NPM package.
While this file is available on the release branch, so it's effectively used during artifact preparation,
the file should also be included inside the react-native NPM package.

This commit addresses it.

Changelog:
[Internal] - Make sure sdks/.hermesversion is included inside the NPM package

Reviewed By: dmitryrykun

Differential Revision: D36785480

fbshipit-source-id: 1152de77818e92814b402a57ca5a05c235747eac

Author: cortinico

package.json

@@ -57,6 +57,7 @@
     "scripts/react_native_pods_utils/script_phases.sh",
     "scripts/react_native_pods.rb",
     "scripts/react-native-xcode.sh",
+    "sdks/.hermesversion",
     "sdks/hermes-engine",
     "sdks/hermesc",
     "template.config.js",