Added some readme info about events in Flysystem
Added some readme info about events in Flysystem

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