fix badge links

Author: TomWFox

README.md

@@ -1,10 +1,10 @@
 # parse-server-example
 
 [![Join The Conversation](https://img.shields.io/discourse/https/community.parseplatform.org/topics.svg)](https://community.parseplatform.org/c/parse-server)
-[![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)
+[![Backers on Open Collective](https://opencollective.com/parse-server/backers/badge.svg)][open-collective-link]
+[![Sponsors on Open Collective](https://opencollective.com/parse-server/sponsors/badge.svg)][open-collective-link]
 [![License][license-svg]][license-link]
-![Twitter Follow](https://img.shields.io/twitter/follow/ParsePlatform.svg?label=Follow%20us%20on%20Twitter&style=social)
+[![Twitter Follow](https://img.shields.io/twitter/follow/ParsePlatform.svg?label=Follow%20us%20on%20Twitter&style=social)](https://twitter.com/intent/follow?screen_name=ParsePlatform)
 
 Example project using the [parse-server](https://github.com/ParsePlatform/parse-server) module on Express.
 
@@ -173,3 +173,4 @@ As of April 5, 2017, Parse, LLC has transferred this code to the parse-community
 
 [license-svg]: https://img.shields.io/badge/license-BSD-lightgrey.svg
 [license-link]: LICENSE
+[open-collective-link]: https://opencollective.com/parse-server