Removed composer self-update from travis config
Removed composer self-update from travis config

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