feat(engine-react): set package to private

Author: bmuenzenmeyer

packages/engine-react/package.json

@@ -2,6 +2,7 @@
   "name": "@pattern-lab/engine-react",
   "description": "The React engine for Pattern Lab / Node",
   "version": "0.2.1-beta.1",
+  "private": true,
   "main": "lib/engine_react.js",
   "dependencies": {
     "babel-core": "6.17.0",