docs/docker: update year in copyright banner
docs/docker: update year in copyright banner

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