update gemspec manifest
update gemspec manifest

hiroshi/useragent,yappbox/useragent,clemens/useragent,yyyc514/useragent,paulcbetts/useragent,superp/useragent,ishumilova/useragent,joneslee85/useragent,wavii/useragent,clevertechru/useragent,michaeldauria/useragent,SalesLoft/useragent,springleaf/useragent,ndbroadbent/useragent,crashlytics/useragent,art19/useragent,assembler/useragent,mkilling/useragent,jasonfb/useragent,xing/useragent,intercom/useragent,imulus/useragent,dgraham/useragent,Magnetic/useragent,mycolorway/useragent,tape-tv/useragent,jakswa/useragent,545ch4/useragent,brjennin/bond,bf4/useragent,charliesome/useragent,michieldewit/useragent,arches/useragent,gshutler/useragent,albertbellonch/useragent