[SYNPY-1714] Fix RTD builds (#1286)

* Update project name in README

* import -> inventories in mkdocs.yml config for python handler

Author: jaymedina

README.md

@@ -1,4 +1,4 @@
-Python Synapse Client
+Synapse Python Client
 =====================
 
 Branch  | Build Status

mkdocs.yml

@@ -193,7 +193,7 @@ plugins:
       default_handler: python
       handlers:
         python:
-          import:
+          inventories:
           - https://docs.python.org/3/objects.inv
           - https://python-markdown.github.io/objects.inv
           options: