Remove Gitter link from README.md

Author: fmbenhassine

README.md

@@ -1,5 +1,3 @@
-<a href="https://gitter.im/spring-batch/Lobby?source=badge"><img src="https://badges.gitter.im/spring-projects/spring-batch.svg"/></a>
-
 # Spring Batch [![build status](https://build.spring.io/plugins/servlet/wittified/build-status/BATCH-GRAD)](https://build.spring.io/browse/BATCH-GRAD)
 
 Spring Batch is a lightweight, comprehensive batch framework designed to enable the development of robust batch applications vital for the daily operations of enterprise systems.  Spring Batch builds upon the productivity, POJO-based development approach, and general ease of use capabilities people have come to know from the [Spring Framework](https://github.com/spring-projects/spring-framework), while making it easy for developers to access and leverage more advanced enterprise services when necessary.
@@ -45,10 +43,10 @@ If you are new to Spring as well as to Spring Batch, look for information about
 
 Here are some ways for you to get involved in the community:
 
-* Get involved with the Spring community on the Spring Community Forums.  Please help out on the [gitter channel](https://gitter.im/spring-batch/Lobby) by responding to questions and joining the debate.
+* Get involved with the Spring Batch community on [Twitter](https://twitter.com/springbatch) and [StackOverflow](https://stackoverflow.com/questions/tagged/spring-batch) by responding to questions and joining the debate.
 * Create [issues](https://github.com/spring-projects/spring-batch/issues) for bugs and new features and comment and vote on the ones that you are interested in.
 * Github is for social coding: if you want to write code, we encourage contributions through pull requests from [forks of this repository](https://help.github.com/forking/).  If you want to contribute code this way, please familiarize yourself with the process outlined for contributing to Spring projects here: [Contributor Guidelines](https://github.com/spring-projects/spring-batch/blob/master/CONTRIBUTING.md).
-* Watch for upcoming articles on Spring by [subscribing](feed://assets.spring.io/drupal/node/feed.xml) to spring.io
+* Watch for upcoming articles on Spring by [subscribing](feed://assets.spring.io/drupal/node/feed.xml) to [spring.io](https://spring.io).
 
 Before we accept a non-trivial patch or pull request we will need you to sign the [contributor's agreement](https://support.springsource.com/spring_committer_signup).  Signing the contributor's agreement does not grant anyone commit rights to the main repository, but it does mean that we can accept your contributions, and you will get an author credit if we do.  Active contributors might be asked to join the core team, and given the ability to merge pull requests.