Update travis configuration
Update travis configuration

peatpon/line-bot-sdk,Squamoto/line-bot,line/line-bot-sdk-php,thearsenalfanz/line-bot-sdk-php,thearsenalfanz/line-bot-sdk-php,kiwi-26/line-bot-sdk-php,addachannel/addabot,line/line-bot-sdk-php,addachannel/addabot,peatpon/line-bot-sdk,kiwi-26/line-bot-sdk-php