Update README.md

Author: snaketron

README.md

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 # IgGeneUsage <a href="https://github.com/snaketron/IgGeneUsage/"><img src="inst/extdata/iglogo.png" height = 120 width = 120 alt="Logo"/>
 
-[![Lifecycle: stable](https://img.shields.io/badge/lifecycle-stable-green.svg)](https://www.tidyverse.org/lifecycle/#stable) [![Build Status Travis](https://travis-ci.org/snaketron/IgGeneUsage.svg?branch=master)](https://travis-ci.org/snaketron/IgGeneUsage) [![codecov](https://codecov.io/gh/snaketron/IgGeneUsage/branch/master/graph/badge.svg)](https://codecov.io/github/snaketron/IgGeneUsage)
+[![Lifecycle: stable](https://img.shields.io/badge/lifecycle-stable-green.svg)](https://www.tidyverse.org/lifecycle/#stable) [![codecov](https://codecov.io/gh/snaketron/IgGeneUsage/branch/master/graph/badge.svg)](https://codecov.io/github/snaketron/IgGeneUsage)
 
 # Overview
 IgGeneUsage: computational tool for the analysis of differential gene usage (DGU) in B- and T-cell receptor repertoires.