chore: add lint script to .travis.yml
chore: add lint script to .travis.yml

trusktr/engine,woltemade/engine,beni55/engine,Famous/engine,talves/famous-engine,infamous/engine,prepare/engine,CedarLogic/engine,IjzerenHein/engine,andreaslangsays/engine,Bizboard/engine,Wanderfalke/engine,arunabhdas/engine,CedarLogic/engine,infamous/famous-engine,talves/famous-engine,TheAlphaNerd/engine,artichox/engine,woltemade/engine,codesdk/engine,redwoodfavorite/engine,infamous/engine,noikiy/engine,Wanderfalke/engine,redwoodfavorite/engine,arunabhdas/engine,steveblue/engine,beni55/engine,TheAlphaNerd/engine,trusktr/engine,IjzerenHein/engine,huanghjb/engine,avikalpa/engine,nmai/engine,sonwh98/engine,avikalpa/engine,codesdk/engine,aug2uag/engine,Morgantheplant/engine,mcanthony/engine,sonwh98/engine,Bizboard/engine,tbossert/engine,Famous/engine,manyoo/engine,yummy222/engine,Morgantheplant/engine,infamous/famous-engine,aug2uag/engine,alexanderGugel/engine,alexanderGugel/engine,andreaslangsays/engine,mcanthony/engine,nmai/engine,steveblue/engine,prepare/engine,manyoo/engine,huanghjb/engine,tbossert/engine,noikiy/engine,artichox/engine,yummy222/engine