Update badges

README.md

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 # zola (né Gutenberg)
 
-[![Build Status](https://travis-ci.com/getzola/zola.svg?branch=master)](https://travis-ci.com/getzola/zola)
-[![Build status](https://ci.appveyor.com/api/projects/status/i0ufvx2sdm2cmawo/branch/master?svg=true)](https://ci.appveyor.com/project/Keats/zola/branch/master)
+[![Build Status](https://dev.azure.com/getzola/zola/_apis/build/status/getzola.zola?branchName=master)](https://dev.azure.com/getzola/zola/_build/latest?definitionId=1&branchName=master)
 
 A fast static site generator in a single binary with everything built-in.