refactor(idea): set language level to 1.8
refactor(idea): set language level to 1.8

apache/incubator-groovy,paulk-asert/groovy,paulk-asert/groovy,armsargis/groovy,shils/groovy,apache/incubator-groovy,shils/incubator-groovy,jwagenleitner/groovy,paulk-asert/incubator-groovy,apache/incubator-groovy,russel/groovy,paulk-asert/incubator-groovy,traneHead/groovy-core,dpolivaev/groovy,apache/groovy,jwagenleitner/incubator-groovy,avafanasiev/groovy,apache/groovy,shils/groovy,paulk-asert/groovy,armsargis/groovy,shils/incubator-groovy,russel/incubator-groovy,jwagenleitner/incubator-groovy,avafanasiev/groovy,jwagenleitner/incubator-groovy,armsargis/groovy,shils/groovy,jwagenleitner/incubator-groovy,shils/incubator-groovy,jwagenleitner/groovy,paulk-asert/groovy,russel/groovy,paulk-asert/incubator-groovy,russel/incubator-groovy,dpolivaev/groovy,avafanasiev/groovy,jwagenleitner/groovy,jwagenleitner/groovy,dpolivaev/groovy,russel/groovy,paulk-asert/incubator-groovy,apache/incubator-groovy,traneHead/groovy-core,apache/groovy,armsargis/groovy,dpolivaev/groovy,avafanasiev/groovy,traneHead/groovy-core,traneHead/groovy-core,shils/incubator-groovy,shils/groovy,paulk-asert/incubator-groovy,russel/incubator-groovy,russel/incubator-groovy,apache/groovy,russel/groovy