Don't warn for SQLite with create if not exists
Don't warn for SQLite with create if not exists

Closes #689
CorvusCorrax/knex,joepie91/knex,olalonde/knex,freakynit/knex,joeframbach/knex,threadmeup/knex,socialtables/knex,harriha/knex,elhigu/knex,whitelynx/knex,Atlantis-Software/knex,danieltdt/knex,jevakallio/knex,lanetix/knex,faradayio/knex,chuym/knex,CorvusCorrax/knex,galenandrew/knex,chris-olszewski/knex,chrisbroome/knex,nkt/knex,fgcartographix/knex,faradayio/knex,dieface/knex,galenandrew/knex,MWGitHub/knex,xaka/knex,sxhao/knex,jevakallio/knex,wubzz/knex,tschuy/knex,threadmeup/knex,linalu1/knex,beppu/knex,elhigu/knex,chrisbroome/knex,chuym/knex,eknkc/knex,ryanwilliamquinn/knex,vschoettke/knex,sxhao/knex,freakynit/knex,elhigu/knex,danieltdt/knex,vellotis/knex,whitelynx/knex,knax/knex-bower,vschoettke/knex,tgriesser/knex,noodle/knex,shutterstock/knex,vschoettke/knex,myndzi/knex,realtymaps/knex,vellotis/knex,carragom/knex,fgcartographix/knex,ryanwilliamquinn/knex,seegno-forks/knex,shutterstock/knex,vellotis/knex,realtymaps/knex,juanjoLenero/knex,lanetix/knex,maxcnunes/knex,danieltdt/knex,faradayio/knex,ryanwilliamquinn/knex,maxcnunes/knex,beppu/knex,abegines/knex,joepie91/knex,lanetix/knex,wubzz/knex,shutterstock/knex,statyan/knex,Atlantis-Software/knex,harriha/knex,knax/knex-bower,MadcapJake/knex,olalonde/knex,blah238/knex,noodle/knex,yelmontaser/knex,xaka/knex,WaltRock/knex,eknkc/knex,dieface/knex,jut-io/knex,jut-io/knex,knax/knex-bower,linalu1/knex,realtymaps/knex,beppu/knex,juanjoLenero/knex,WaltRock/knex,chrisbroome/knex,whitelynx/knex,tschuy/knex,tschuy/knex,jevakallio/knex,MWGitHub/knex,chuym/knex,willrstern/knex,sanchesic89/knex,harriha/knex,sanchesic89/knex,eknkc/knex,tgriesser/knex,nkt/knex,socialtables/knex,fgcartographix/knex,blah238/knex,willrstern/knex,nkt/knex,joeframbach/knex,xaka/knex,freakynit/knex,joeframbach/knex,juanjoLenero/knex,galenandrew/knex,chris-olszewski/knex,tgriesser/knex,blah238/knex,joepie91/knex,socialtables/knex,techniq/knex,myndzi/knex,seegno-forks/knex,yelmontaser/knex,jamesanthonyferguson/knex,willrstern/knex,dieface/knex,threadmeup/knex,jamesanthonyferguson/knex,MadcapJake/knex,seegno-forks/knex,linalu1/knex,carragom/knex,abegines/knex,chris-olszewski/knex,statyan/knex,maxcnunes/knex,jut-io/knex,techniq/knex,MadcapJake/knex,sxhao/knex,techniq/knex,MWGitHub/knex,yelmontaser/knex,olalonde/knex,jamesanthonyferguson/knex,sanchesic89/knex