Update README to reflect minimum vim version
Update README to reflect minimum vim version

bonds/neomake,KariusDx/neomake,bonds/neomake,nerdrew/neomake,nerdrew/neomake,euclio/neomake,euclio/neomake,codeinabox/neomake,neomake/neomake,datanoise/neomake,neomake/neomake