update .gitignore with vendors and composer.lock
update .gitignore with vendors and composer.lock

brianium/paratest,quizlet/paratest,chbiel/paratest,chbiel/paratest,localheinz/paratest,RojerUA/paratest,ThomasDelteil/paratest,localheinz/paratest,brianium/paratest,RojerUA/paratest,quizlet/paratest,ThomasDelteil/paratest