Replace travis badge with github CI badge.

Author: chriselrod

README.md

@@ -1,6 +1,6 @@
 # ArrayInterface.jl
 
-[![Build Status](https://travis-ci.com/SciML/ArrayInterface.jl.svg?branch=master)](https://travis-ci.com/SciML/ArrayInterface.jl)
+![CI](https://github.com/SciML/ArrayInterface.jl/workflows/CI/badge.svg)
 [![Build status](https://ci.appveyor.com/api/projects/status/s4vnsj386dyyv655?svg=true)](https://ci.appveyor.com/project/ChrisRackauckas/arrayinterface-jl)
 [![codecov](https://codecov.io/gh/SciML/ArrayInterface.jl/branch/master/graph/badge.svg?token=Yfe2Qzk0JI)](https://codecov.io/gh/SciML/ArrayInterface.jl)