include the non-transformed code in the npm package

Author: aminya

.npmignore

@@ -1,7 +1,6 @@
 spec
 script
 src
-lib
 .npmignore
 .DS_Store
 npm-debug.log

README.md

@@ -74,3 +74,9 @@ const {Disposable} = require('event-kit')
 
 const disposable = new Disposable(() => this.destroyResource())
 ```
+
+### Using ES6 Code
+You can use the ES6 style classes from `lib` directory.
+```
+const {Disposable} = require('event-kit/lib/event-kit')
+```