Add tests for CurlHTTPClient
Add tests for CurlHTTPClient

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