Fix docs url pointing to previous development branch

Signed-off-by: Lilly Rose Berner <[email protected]>

Author: LostLuma

docs/conf.py

@@ -75,7 +75,7 @@
 
 html_theme_options = dict(
     project_name="Documentation",
-    github_url="https://github.com/PythonistaGuild/TwitchIO/tree/dev/3.0/docs/",
+    github_url="https://github.com/PythonistaGuild/TwitchIO/tree/master/docs/",
     logo="logo.png",
     logo_alt="TwitchIO",
     logo_height=120,