accept custom reporter as constructor
accept custom reporter as constructor

testingbot/webdriverjs,monolithed/webdriverio,sebastiendavid/webdriverio,Risto-Stevcev/webdriverio,monolithed/webdriverio,testingbot/webdriverjs,Pitzcarraldo/webdriverio,Pitzcarraldo/webdriverio,Risto-Stevcev/webdriverio,sebastiendavid/webdriverio