Change mockery version for HHVM
Change mockery version for HHVM

twistor/flysystem,farmisen/flysystem,hannesvdvreken/flysystem,twistor/flysystem,CarsonF/flysystem,concrete5/flysystem,sohelrana820/flysystem,rossriley/flysystem,mapyo/flysystem,oswaldderiemaecker/flysystem,nao-pon/flysystem,dshafik/flysystem,barryvdh/flysystem,dstockto/flysystem,mhlavac/flysystem,mhlavac/flysystem,Amrit01/flysystem,sachintaware/flysystem