Revert "Add php user agent"
Revert "Add php user agent"

This reverts commit 7ed6f5258d516aa7190b433ee40d844133836485.

PhillyOpen/Twilio-ss-module,manoscrafted/Twilio-for-Joomla,Git-Host/twilio-php,PhillyOpen/Twilio-ss-module,pablophg/twilio-php,javierwilson/twilio-php,beachboysapp/urgentMe,manoscrafted/Twilio-for-Joomla,beachboysapp/urgentMe,achoe/twilio-php,sayan801/twilio-php,twilio/twilio-php,FTrubitz/twilio-php,MartinAmps/twilio-php