updated badge

Author: comtihon

README.md

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 This is the [MongoDB](https://www.mongodb.org/) driver for Erlang.
 
-[![Build Status](https://travis-ci.com/comtihon/mongodb-erlang.svg?branch=master)](https://travis-ci.com/comtihon/mongodb-erlang)
+[![Run tests](https://github.com/comtihon/mongodb-erlang/actions/workflows/test.yml/badge.svg)](https://github.com/comtihon/mongodb-erlang/actions/workflows/test.yml)
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 ### Usage