Fixed npm run dev script.
Fixed npm run dev script.

joshghent/es6-fiddle-web,vcapretz/esfiddle,joshghent/es6-fiddle-web,esfiddle/esfiddle,collinmesser/esfiddle,asiyani/esfiddle,esfiddle/esfiddle,esfiddle/esfiddle,collinmesser/esfiddle,asiyani/esfiddle,vcapretz/esfiddle