Updated changelog for the interface refactoring.
Updated changelog for the interface refactoring.

oswaldderiemaecker/flysystem,twistor/flysystem,CarsonF/flysystem,hannesvdvreken/flysystem,sohelrana820/flysystem,mhlavac/flysystem,twistor/flysystem,farmisen/flysystem,dstockto/flysystem,mapyo/flysystem,mhlavac/flysystem,sachintaware/flysystem,Amrit01/flysystem,nao-pon/flysystem,rossriley/flysystem,barryvdh/flysystem,dshafik/flysystem