Fixed Spotify's deprecation of http and localhost (#1187)

* spotify's deprecation of http and localhost

* updated instead of changed

* pep8

* fixing thing that i broke

CHANGELOG.md

@@ -24,6 +24,7 @@ Add your changes below.
 
 - Updated get_cached_token and save_token_to_cache methods to utilize Python's Context Management Protocol
 - Added except clause to get_cached_token method to handle json decode errors
+- Added warnings and updated docs due to Spotify's deprecation of HTTP and "localhost" redirect URIs
 
 ### Removed