Update Travis CI build status badge in README.md

Author: njhill

README.md

@@ -1,4 +1,4 @@
-[![Build Status](https://travis-ci.com/IBM/etcd-java.svg?branch=main)](https://travis-ci.com/IBM/etcd-java)
+[![Build Status](https://app.travis-ci.com/IBM/etcd-java.svg?branch=main)](https://app.travis-ci.com/github/IBM/etcd-java)
 
 # etcd-java
 
@@ -155,4 +155,4 @@ etcd-java was originally developed within IBM for production use. At that time j
 jetcd has since matured but we still prefer the consumability of etcd-java's API. Now that etcd-java has been open-sourced, it would be great to collaborate on further development and explore the possibility of combining the best of both clients.
 
 
-The key differences are included in the bulleted feature list at the top of this README.
+The key differences are included in the bulleted feature list at the top of this README.