Update README.md

Author: cmeissner

README.md

@@ -2,7 +2,7 @@
 
 [![PyPI version](https://badge.fury.io/py/click-types.svg)](https://badge.fury.io/py/click-types)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/ed3511c33a254bfe942777c9ef3251e3)](https://www.codacy.com/gh/codeaffen/click-types/dashboard?utm_source=github.com&utm_medium=referral&utm_content=codeaffen/click-types&utm_campaign=Badge_Grade)
-[![Documentation Status](https://readthedocs.org/projects/click-types/badge/?version=latest)](https://click-types.readthedocs.io/en/latest/?badge=latest)
+[![Documentation Status](https://readthedocs.org/projects/click-types/badge/?version=develop)](https://click-types.readthedocs.io/en/latest/?badge=develop)
 
 [click](https://click.palletsprojects.com) is the `Command line interface creation kit` and it helps you to create command line interfaces with some few lines of code. Click comes with meaningful defauls to make starting with it as easy as possible.