Enhancement for best practice prop types. (#70)

* Fixes #69: Adding capability to reduce production build output size and
allow users that import this package to include prop types in
development and optionally remove them using Webpacks UglifyJS + Define
plugin.

* Updated .babelrc that properly wraps prop-types.

* Restoring the original constant declaration for prop types as uglify
does find dead code and remove it.

* Updating changelog.

.babelrc

@@ -9,6 +9,7 @@
   "plugins": [
     "dev-expression",
     "add-module-exports",
-    "transform-object-assign"
+    "transform-object-assign",
+    ["transform-react-remove-prop-types", { mode: "wrap" }]
   ],
 }

CHANGELOG.md

@@ -2,16 +2,24 @@
 > 2017-XX-XX
 
 - **Feature:** Dist build now includes both production and development builds ([#64])
+- **Feature:** PropTypes are now wrapped allowing for lighter weight production builds ([#69])
+
+[#64]: https://github.com/reactjs/react-transition-group/issues/64
+[#69]: https://github.com/reactjs/react-transition-group/issues/69
+[v1.1.X]: https://github.com/reactjs/react-transition-group/compare/v1.1.3...master
 
 ## [v1.1.3]
 > 2017-05-02
 
 - bonus release, no additions
 
+[v1.1.3]: https://github.com/reactjs/react-transition-group/compare/v1.1.2...v1.1.3
+
 ## [v1.1.2]
 > 2017-05-02
 
 - **Bugfix:** Fix refs on children ([#39])
+
 [v1.1.2]: https://github.com/reactjs/react-transition-group/compare/v1.1.1...v1.1.2
 [#39]: https://github.com/reactjs/react-transition-group/pull/39
 

package.json

@@ -57,6 +57,7 @@
     "babel-plugin-add-module-exports": "^0.2.1",
     "babel-plugin-dev-expression": "^0.2.1",
     "babel-plugin-transform-object-assign": "^6.22.0",
+    "babel-plugin-transform-react-remove-prop-types": "^0.4.5",
     "babel-preset-latest": "^6.24.0",
     "babel-preset-react": "^6.23.0",
     "babel-preset-stage-2": "^6.18.0",