Merge pull request #8 from adafruit/update-docs-link

Update RTD link to use CP subproject link.

Author: siddacious

README.rst

@@ -3,7 +3,7 @@ Introduction
 ============
 
 .. image:: https://readthedocs.org/projects/adafruit-circuitpython-lis2mdl/badge/?version=latest
-    :target: https://adafruit-circuitpython-lis2mdl.readthedocs.io/en/latest/
+    :target: https://circuitpython.readthedocs.io/projects/lis2mdl/en/latest/
     :alt: Documentation Status
 
 .. image :: https://img.shields.io/discord/327254708534116352.svg