adding badges

Author: tlienart

README.md

@@ -1 +1,5 @@
-# MLJModelInterface.jl
+# MLJModelInterface.jl
+
+| [MacOS/Linux] | Coverage |
+| :-----------: | :------: |
+| [![Build Status](https://travis-ci.org/alan-turing-institute/MLJModelInterface.jl.svg?branch=master)](https://travis-ci.org/alan-turing-institute/MLJModelInterface.jl) | [![codecov.io](http://codecov.io/github/alan-turing-institute/MLJModelInterface.jl/coverage.svg?branch=master)](http://codecov.io/github/alan-turing-institute/MLJModelInterface.jl?branch=master) |