Export the component directly, not as *.default

Using this module in node previously required a
`var ContentEditable = require("react-contenteditable").default`
Now, importing the module is done with
`var ContentEditable = require("react-contenteditable")`

This commit BREAKS COMPATIBILITY (thus, there was a version bump)

Fixes #12
Thanks to @sebasgarcep
See esnext/es6-module-transpiler#85 for more info

lib/react-contenteditable.js

@@ -75,4 +75,5 @@ var ContentEditable = function (_React$Component) {
   return ContentEditable;
 }(_react2.default.Component);
 
-exports.default = ContentEditable;
+exports.default = ContentEditable;
+module.exports = exports['default'];

package.json

@@ -1,6 +1,6 @@
 {
   "name": "react-contenteditable",
-  "version": "1.1.0",
+  "version": "2.0.0",
   "description": "React component representing a <div> with editable contents",
   "main": "./lib/react-contenteditable.js",
   "peerDependencies": {
@@ -21,6 +21,7 @@
   },
   "devDependencies": {
     "babel-cli": ">=6",
+    "babel-plugin-add-module-exports": ">=0",
     "babel-plugin-transform-object-assign": ">=6",
     "babel-preset-es2015": ">=6"
   },
@@ -29,7 +30,8 @@
       "es2015"
     ],
     "plugins": [
-      "transform-object-assign"
+      "transform-object-assign",
+      "add-module-exports"
     ]
   },
   "scripts": {