readme: fix link to charm repositories
readme: fix link to charm repositories

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