set target also to 1.6
set target also to 1.6

blevandowski-lv/graphql-java,blevandowski-lv/graphql-java,fderose/graphql-java,graphql-java/graphql-java,graphql-java/graphql-java,dminkovsky/graphql-java,fderose/graphql-java,dminkovsky/graphql-java