Removed 5.3 from travis
Removed 5.3 from travis

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