message: chore(readme): update link to travis.com
diff: @@ -11,7 +11,7 @@ Best way to quickly integrate <a href="https://getbootstrap.com/">Bootstrap 3</a
  <p align="center">
  <a href="https://badge.fury.io/js/ngx-bootstrap"><img src="https://badge.fury.io/js/ngx-bootstrap.svg" alt="npm version" ></a>
  <a href="https://npmjs.org/ngx-bootstrap"><img src="https://img.shields.io/npm/dm/ngx-bootstrap.svg" alt="npm downloads" ></a>
  -<a href="https://travis-ci.org/valor-software/ngx-bootstrap"><img alt="" src="https://travis-ci.org/valor-software/ngx-bootstrap.svg?branch=development"></a>
  +<a href="https://travis-ci.org/valor-software/ngx-bootstrap"><img alt="" src="https://travis-ci.com/valor-software/ngx-bootstrap.svg?branch=development"></a>
  <a target="_blank" href="https://opencollective.com/ngx-bootstrap"><img src="https://opencollective.com/ngx-bootstrap/tiers/backer/badge.svg?label=backer&color=brightgreen" /></a>
  <br/>
  