Downgrade swoole to pass travis 5.6 test
Downgrade swoole to pass travis 5.6 test

Harmonic/laradock,bestlong/laradock,LaraDock/laradock,luciano-jr/laradock,jfoliveira/laradock,springjk/laradock,jinnawat/laradock,zuohuadong/laradock,jinnawat/laradock,hnquang112/laradock,schiggi/laradock,AliveCorpse/laradock,springjk/laradock,zuohuadong/laradock,springjk/laradock,hp9390/laradock,ralphowino/laradock,AliveCorpse/laradock,ralphowino/laradock,tharaxodia/laradock,hnquang112/laradock,zuohuadong/laradock,cjnchk/laradock,springjk/laradock,ralphowino/laradock,jfoliveira/laradock,schiggi/laradock,bestlong/laradock,arkadiusjonczek/laradock,tharaxodia/laradock,Harmonic/laradock,arkadiusjonczek/laradock,schiggi/laradock,jinnawat/laradock,arkadiusjonczek/laradock,jinnawat/laradock,Harmonic/laradock,hp9390/laradock,zuohuadong/laradock,cjnchk/laradock,cjnchk/laradock,bestlong/laradock,hnquang112/laradock,luciano-jr/laradock,cjnchk/laradock,schiggi/laradock,hnquang112/laradock,ralphowino/laradock,bestlong/laradock,bestlong/laradock,arkadiusjonczek/laradock,Harmonic/laradock