Fixing `grunt-traceur` version
Fixing `grunt-traceur` version

The version of `grunt-traceur` was not as fixed, so the `npm` can install changes causing errors in the execulção `azk`.

juniorribeiro/azk,agendor/azk,saitodisse/azk,Klaudit/azk,juniorribeiro/azk,fearenales/azk,heitortsergent/azk,heitortsergent/azk,slobo/azk,azukiapp/azk,marcusgadbem/azk,fearenales/azk,agendor/azk,nuxlli/azk,gullitmiranda/azk,teodor-pripoae/azk,Klaudit/azk,teodor-pripoae/azk,renanmpimentel/azk,renanmpimentel/azk,saitodisse/azk-travis-test,marcusgadbem/azk,azukiapp/azk,slobo/azk,saitodisse/azk-travis-test,gullitmiranda/azk,nuxlli/azk,saitodisse/azk