fix typo in help command

rackt dev -> rackt server

tasks/help

@@ -5,7 +5,7 @@ echo ""
 echo "Commands:"
 echo "  init <name>   Creates a folder called <name> and generates a component structure."
 echo "  build         Builds the component to dist/ for UMD, and build/ for CommonJS."
-echo "  dev           Start the dev server using port 8080."
+echo "  server        Start the dev server using port 8080."
 echo "  release       Publish a new release to npm. Use --preview to preview release"
 echo "  test          Run the test suite. Use --single-run for single run."
 echo "  pages         Deploys the examples to gh-pages."