update README [ci skip]

Author: Jutho

README.md

@@ -4,7 +4,7 @@ Type stable methods for treating small homogeneous tuples as collections.
 
 | **Documentation**                                                               | **Build Status**                                                                                |
 |:-------------------------------------------------------------------------------:|:-----------------------------------------------------------------------------------------------:|
-| [![][docs-stable-img]][docs-stable-url] [![][docs-dev-img]][docs-dev-url] | [![][travis-img]][travis-url] [![][appveyor-img]][appveyor-url] [![][codecov-img]][codecov-url] [![][coveralls-img]][coveralls-url] |
+| [![][docs-stable-img]][docs-stable-url] [![][docs-dev-img]][docs-dev-url] | [![CI][ci-img]][ci-url] [![][appveyor-img]][appveyor-url] [![][codecov-img]][codecov-url] |
 
 
 [docs-dev-img]: https://img.shields.io/badge/docs-dev-blue.svg
@@ -13,14 +13,8 @@ Type stable methods for treating small homogeneous tuples as collections.
 [docs-stable-img]: https://img.shields.io/badge/docs-stable-blue.svg
 [docs-stable-url]: https://jutho.github.io/TupleTools.jl/stable
 
-[travis-img]: https://travis-ci.org/Jutho/TupleTools.jl.svg?branch=master
-[travis-url]: https://travis-ci.org/Jutho/TupleTools.jl
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-[appveyor-img]: https://ci.appveyor.com/api/projects/status/github/Jutho/TensorOperations.jl?svg=true&branch=master
-[appveyor-url]: https://ci.appveyor.com/project/jutho/tupletools-jl/branch/master
+[ci-img]: https://github.com/Jutho/TupleTools.jl/actions/workflows/ci.yml/badge.svg
+[ci-url]: https://github.com/Jutho/TupleTools.jl/actions/workflows/ci.yml
 
 [codecov-img]: https://codecov.io/gh/Jutho/TupleTools.jl/branch/master/graph/badge.svg
 [codecov-url]: https://codecov.io/gh/Jutho/TupleTools.jl
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-[coveralls-img]: https://coveralls.io/repos/github/Jutho/TupleTools.jl/badge.svg?branch=master
-[coveralls-url]: https://coveralls.io/github/Jutho/TupleTools.jl