travis: fix nvm install
travis: fix nvm install

nmfzone/gopherjs,govlas/gopherjs,albrow/gopherjs,Archs/gopherjs,govlas/gopherjs,jeremyschlatter/gopherjs,Yanjing123/gopherjs,flimzy/gopherjs,bpowers/gopherjs,albrow/gopherjs,gopherjs/gopherjs,flimzy/gopherjs,rasata/gopherjs,nmfzone/gopherjs,jargv/gopherjs,gopherjs/gopherjs,gopherjs/gopherjs,ebroder/gopherjs,gopherjs/gopherjs,bpowers/gopherjs,jeremyschlatter/gopherjs,bpowers/gopherjs,roth1002/gopherjs,roth1002/gopherjs,roth1002/gopherjs,ebroder/gopherjs,albrow/gopherjs,govlas/gopherjs,rasata/gopherjs,ebroder/gopherjs,jargv/gopherjs,Yanjing123/gopherjs,gopherjs/gopherjs,Archs/gopherjs,Yanjing123/gopherjs,Archs/gopherjs,nmfzone/gopherjs,jeremyschlatter/gopherjs,flimzy/gopherjs,jargv/gopherjs,rasata/gopherjs