Changed method parameter name same as for other SDKs
Changed method parameter name same as for other SDKs

peatpon/line-bot-sdk,kiwi-26/line-bot-sdk-php,kiwi-26/line-bot-sdk-php,Squamoto/line-bot,line/line-bot-sdk-php,line/line-bot-sdk-php,peatpon/line-bot-sdk