travis: clean ignored files before running check-fmt
travis: clean ignored files before running check-fmt

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