[Fix] move loose-envify back to production deps, for browerify usage

Fixes #203

Author: ljharb

package.json

@@ -25,6 +25,7 @@
   },
   "homepage": "https://facebook.github.io/react/",
   "dependencies": {
+    "loose-envify": "^1.4.0",
     "object-assign": "^4.1.1",
     "react-is": "^16.8.1"
   },
@@ -45,7 +46,6 @@
     "bundle-collapser": "^1.2.1",
     "eslint": "^5.13.0",
     "jest": "^19.0.2",
-    "loose-envify": "^1.4.0",
     "react": "^15.5.1",
     "uglifyify": "^3.0.4",
     "uglifyjs": "^2.4.10"