Makefile: use -W flag in sphinx-build
Makefile: use -W flag in sphinx-build

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