Fix memory leak in SpotifyApi via Unmanaged ThreadLocal (Resolves #450)#451

QiuYucheng2003 wants to merge 2 commits intospotify-web-api-java:mainspotify-web-api-java/spotify-web-api-java:mainfrom

QiuYucheng2003:fix-memory-leak-issue-450QiuYucheng2003/spotify-web-api-java:fix-memory-leak-issue-450Copy head branch name to clipboard