isort Module is Observed in /spotipy/* (#589)

* isort observed

* Update CHANGELOG.md

* Update CHANGELOG.md

* Update CONTRIBUTING.md

CHANGELOG.md

@@ -5,12 +5,17 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+
 ## Unreleased
 
 ### Fixed
 
 - SpotifyException now thrown when a request fails & has no response ( fixes #571, #581 )
 
+### Changed
+
+- both inline and starting import lists are sorted using `isort` module
+
 ## [2.16.0] - 2020-09-16
 
 ### Added