Remove note about missing maintainers

Looks like this is pretty well supported, no need to scare people off with that message!

Author: mxstbr

README.md

@@ -13,12 +13,6 @@ Simple HTML5-compliant drag'n'drop zone for files built with React.js.
 Documentation and examples: https://react-dropzone.js.org
 Source code: https://github.com/react-dropzone/react-dropzone/
 
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-**Looking for maintainers: https://github.com/react-dropzone/react-dropzone/issues/479**
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 ## Installation
 
 Install it from npm and include it in your React build process (using [Webpack](http://webpack.github.io/), [Browserify](http://browserify.org/), etc).