Update Readme.md

Author: chriddyp

Readme.md

@@ -7,7 +7,7 @@ The User Guide was written with the goal of giving Plotly Python (and IPython)
 users extensive documentation on almost all of Plotly's features. 
 
 Whereas Plotly's [web documentation and
-gallery](https://plot.ly/api/python/docs) is meant to serve Plotly beginners
+gallery](https://plot.ly/python) is meant to serve Plotly beginners
 just looking to make a simple plot and experienced users trying out a new plot
 type.  The User Guide intends to make beginner and intermediate Plotly users
 experts.