makefile: run metalinter only on 1.6+
makefile: run metalinter only on 1.6+

guilhermebr/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,gwmoura/tsuru,guilhermebr/tsuru,ggarnier/tsuru,ggarnier/tsuru,ggarnier/tsuru,ggarnier/tsuru,gwmoura/tsuru,cezarsa/tsuru,guilhermebr/tsuru,guilhermebr/tsuru,tsuru/tsuru,cezarsa/tsuru,tsuru/tsuru,tsuru/tsuru,ArxdSilva/tsuru,ArxdSilva/tsuru,cezarsa/tsuru,ArxdSilva/tsuru,tsuru/tsuru,gwmoura/tsuru