Clarify behaviour of Throttled in README
Clarify behaviour of Throttled in README

Clarified Throttled parameter's behaviour after @jonahss' change in 7.0.0
bytbil/gulp-saucelabs,asfaltboy/grunt-saucelabs,Nycto/grunt-saucelabs,sourishkrout/grunt-saucelabs,axemclion/grunt-saucelabs,PaulWells/grunt-saucelabs,asfaltboy/grunt-saucelabs,xi/grunt-saucelabs,asfaltboy/grunt-saucelabs,bytbil/gulp-saucelabs,xi/grunt-saucelabs,bytbil/sauce-test-runner,xi/grunt-saucelabs,sourishkrout/grunt-saucelabs,bytbil/sauce-test-runner,sourishkrout/grunt-saucelabs,bytbil/sauce-test-runner,Nycto/grunt-saucelabs,axemclion/grunt-saucelabs,Nycto/grunt-saucelabs,axemclion/grunt-saucelabs,marioestrada/grunt-saucelabs,PaulWells/grunt-saucelabs,PaulWells/grunt-saucelabs,bytbil/gulp-saucelabs,marioestrada/grunt-saucelabs,marioestrada/grunt-saucelabs