docs: drop the dead Travis build badge

travis-ci.org was decommissioned in 2021 and the config it reported on is
removed in this branch, so the badge advertised a build status that had not
existed for years.

Author: 07souravkunda

README.md

@@ -1,7 +1,5 @@
 # browserstack-local-java
 
-[![Build Status](https://travis-ci.org/browserstack/browserstack-local-java.svg?branch=master)](https://travis-ci.org/browserstack/browserstack-local-java)
-
 Java bindings for BrowserStack Local.
 
 ## Installation