README: Update badges

Author: andreasabel

README.md

@@ -1,6 +1,6 @@
 [![Hackage version](https://img.shields.io/hackage/v/haskell-src.svg?label=Hackage)](http://hackage.haskell.org/package/haskell-src)
-[![Hackage CI](https://matrix.hackage.haskell.org/api/v2/packages/haskell-src/badge)](https://matrix.hackage.haskell.org/package/haskell-src)
-[![Travis build status](https://travis-ci.org/haskell-pkg-janitors/haskell-src.svg?branch=master)](https://travis-ci.org/haskell-pkg-janitors/haskell-src)
+[![Stackage LTS version](https://www.stackage.org/package/haskell-src/badge/lts?label=Stackage)](https://www.stackage.org/package/haskell-src)
+[![haskell-src on Stackage Nightly](https://stackage.org/package/haskell-src/badge/nightly)](https://stackage.org/nightly/package/haskell-src)
 [![Cabal build](https://github.com/haskell-pkg-janitors/haskell-src/workflows/Haskell-CI/badge.svg)](https://github.com/haskell-pkg-janitors/haskell-src/actions)
 
 # haskell-src