Fix call function getHTTPStatus in readme
Fix call function getHTTPStatus in readme

forget ().
line/line-bot-sdk-php,kiwi-26/line-bot-sdk-php,addachannel/addabot,Squamoto/line-bot,kiwi-26/line-bot-sdk-php,addachannel/addabot,line/line-bot-sdk-php,peatpon/line-bot-sdk,peatpon/line-bot-sdk