Flovilmart/readme updates (#588)

* chore(package): update dependencies

https://greenkeeper.io/

* chore(travis): whitelist greenkeeper branches 

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* docs(readme): add Greenkeeper badge 

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* fixes

* Better gitignore

* Update README.md

* Update README.md

* Update README.md

Author: flovilmart

.gitignore

@@ -11,4 +11,3 @@ integration/test_logs
 integration/test_logs
 out/
 docs/
-

README.md

@@ -5,6 +5,11 @@
 [![Npm Version][npm-svg]][npm-link]
 [![CDNJS version](https://img.shields.io/cdnjs/v/parse.svg)](https://cdnjs.com/libraries/parse) [![Greenkeeper badge](https://badges.greenkeeper.io/parse-community/Parse-SDK-JS.svg)](https://greenkeeper.io/)
 [![License][license-svg]][license-link]
+[![Greenkeeper badge][greenkeeper-svg]][greenkeeper-link]
+
+[![Backers on Open Collective](https://opencollective.com/parse-server/backers/badge.svg)](#backers)
+[![Sponsors on Open Collective](https://opencollective.com/parse-server/sponsors/badge.svg)](#sponsors)
+
 
 A library that gives you access to the powerful Parse cloud platform from your JavaScript app. For more information on Parse and its features, see [the website](http://parseplatform.org), [the JavaScript guide](http://docs.parseplatform.org/js/guide/) or [API Reference](http://parseplatform.org/Parse-SDK-JS/api/).
 
@@ -61,3 +66,5 @@ As of April 5, 2017, Parse, LLC has transferred this code to the parse-community
  [npm-link]: https://npmjs.org/parse
  [license-svg]: https://img.shields.io/badge/license-BSD-lightgrey.svg
  [license-link]: https://github.com/parse-community/Parse-SDK-JS/blob/master/LICENSE
+ [greenkeeper-svg]: https://img.shields.io/badge/license-BSD-lightgrey.svg
+ [greenkeeper-link]: https://badges.greenkeeper.io/parse-community/Parse-SDK-JS.svg