cmd/client: fix year in copyright header
cmd/client: fix year in copyright header

RichardKnop/tsuru,firebitsbr/tsuru,mderaldo/tsuru,firebitsbr/tsuru,hcxiong/tsuru,Endika/tsuru,jblancett/tsuru,4eek/tsuru,Endika/tsuru,kgrvamsi/tsuru,jblancett/tsuru,ggarnier/tsuru,guilhermebr/tsuru,mderaldo/tsuru,tsuru/tsuru,kgrvamsi/tsuru,RichardKnop/tsuru,hcxiong/tsuru,ArxdSilva/tsuru,hugoantunes/tsuru,cgvarela/tsuru,tuxmonteiro/tsuru,gciotta/tsuru,gwmoura/tsuru,cezarsa/tsuru,gciotta/tsuru,Endika/tsuru,ArxdSilva/tsuru,tuxmonteiro/tsuru,4eek/tsuru,cezarsa/tsuru,guilhermebr/tsuru,mderaldo/tsuru,tuxmonteiro/tsuru,tsuru/tsuru,RichardKnop/tsuru,cgvarela/tsuru,gwmoura/tsuru,cgvarela/tsuru,tsuru/tsuru,cezarsa/tsuru,4eek/tsuru,hcxiong/tsuru,hugoantunes/tsuru,guilhermebr/tsuru,firebitsbr/tsuru,guilhermebr/tsuru,ArxdSilva/tsuru,jblancett/tsuru,ggarnier/tsuru,ArxdSilva/tsuru,ggarnier/tsuru,gciotta/tsuru,kgrvamsi/tsuru,gwmoura/tsuru,ggarnier/tsuru,tsuru/tsuru,cezarsa/tsuru