Remove Gitter chat links

README.md

@@ -5,7 +5,6 @@
 [![MIT license](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/BioJulia/XAM.jl/blob/master/LICENSE)
 [![Stable documentation](https://img.shields.io/badge/docs-stable-blue.svg)](https://biojulia.github.io/XAM.jl/stable)
 [![Latest documentation](https://img.shields.io/badge/docs-dev-blue.svg)](https://biojulia.github.io/XAM.jl/dev/)
-[![Join the chat at https://gitter.im/BioJulia/XAM.jl](https://badges.gitter.im/BioJulia/XAM.jl.svg)](https://gitter.im/BioJulia/XAM.jl)
 
 > This project follows the [semver](http://semver.org) pro forma and uses the [git-flow branching model](https://nvie.com/posts/a-successful-git-branching-model/ "original
 blog post").

docs/src/index.md

@@ -5,7 +5,6 @@
 [![MIT license](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/BioJulia/XAM.jl/blob/master/LICENSE)
 [![Stable documentation](https://img.shields.io/badge/docs-stable-blue.svg)](https://biojulia.github.io/XAM.jl/stable)
 [![Latest documentation](https://img.shields.io/badge/docs-dev-blue.svg)](https://biojulia.github.io/XAM.jl/dev/)
-[![Join the chat at https://gitter.im/BioJulia/XAM.jl](https://badges.gitter.im/BioJulia/XAM.jl.svg)](https://gitter.im/BioJulia/XAM.jl)
 
 > This project follows the [semver](http://semver.org) pro forma and uses the [git-flow branching model](https://nvie.com/posts/a-successful-git-branching-model/).