Update README (#339)

Author: jakobnissen

README.md

@@ -4,7 +4,6 @@
 [![MIT license](https://img.shields.io/badge/license-MIT-green.svg)](https://github.com/BioJulia/BioSequences.jl/blob/master/LICENSE)
 [![Documentation](https://img.shields.io/badge/docs-stable-blue.svg)](https://biojulia.github.io/BioSequences.jl/stable)
 [![Pkg Status](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
-[![Chat](https://img.shields.io/gitter/room/BioJulia/BioSequences.svg)](https://gitter.im/BioJulia/BioSequences.jl)
 
 ## Description
 
@@ -29,8 +28,6 @@ the master branch to try new features before release.
 
 BioSequences is tested against Julia `1.X` on Linux, OS X, and Windows.
 
-[![Unit tests](https://github.com/BioJulia/BioSequences.jl/workflows/Unit%20tests/badge.svg?branch=master)](https://github.com/BioJulia/BioSequences.jl/actions?query=workflow%3A%22Unit+tests%22+branch%3Amaster)
-[![Documentation](https://github.com/BioJulia/BioSequences.jl/workflows/Documentation/badge.svg?branch=master)](https://github.com/BioJulia/BioSequences.jl/actions?query=workflow%3ADocumentation+branch%3Amaster)
 [![](https://codecov.io/gh/BioJulia/BioSequences.jl/branch/master/graph/badge.svg)](https://codecov.io/gh/BioJulia/BioSequences.jl)
 [![Downstream](https://github.com/BioJulia/BioSequences.jl/actions/workflows/Downstream.yml/badge.svg)](https://github.com/BioJulia/BioSequences.jl/actions/workflows/Downstream.yml)
 
@@ -48,18 +45,6 @@ detailed contributor and maintainer guidelines, and code of conduct.
 
 Thank you to all our backers and sponsors!
 
-[![](https://opencollective.com/biojulia/sponsor/0/avatar.svg)](https://opencollective.com/biojulia/sponsor/0/website)
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 ## Questions?
 
 If you have a question about contributing or using BioJulia software, come