Update README.md

Author: vuillaut

README.md

@@ -2,4 +2,6 @@
 
 Generate a changelog from the last release of a gitlab repository
 
-Do it online: [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/vuillaut/GitlabReleaseNotesGenerator/HEAD?labpath=generate.ipynb)
+## Do it online: 
+[![Heroku](https://pyheroku-badge.herokuapp.com/?app=gitlab-release-notes)](https://gitlab-release-notes.herokuapp.com/)
+[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/vuillaut/GitlabReleaseNotesGenerator/HEAD?labpath=generate.ipynb)