Remove Travis badge

Author: nuest

README.Rmd

@@ -17,7 +17,6 @@ knitr::opts_chunk$set(
 
 <!-- badges: start -->
 [![Lifecycle: experimental](https://img.shields.io/badge/lifecycle-experimental-orange.svg)](https://www.tidyverse.org/lifecycle/#experimental)
-[![Travis build status](https://travis-ci.com/nuest/codecheck.svg?branch=master)](https://travis-ci.com/nuest/codecheck)
 [![R build status](https://github.com/codecheckers/codecheck/workflows/R-CMD-check/badge.svg)](https://github.com/codecheckers/codecheck/actions)
 <!-- badges: end -->