Fix syntax error in uploading.js

Forgot to remove the $. from uploading to GitHub Pages when I refactored
the code.

generators/gulp/templates/tasks/uploading.js

@@ -48,7 +48,7 @@ const ghpages = require('gulp-gh-pages');
 // 'gulp deploy' -- pushes your dist folder to Github
 gulp.task('upload', () => {
   return gulp.src('dist/**/*', {dot: true})
-    .pipe($.ghPages());
+    .pipe(ghPages());
 });
 <% } -%>
 <% if (noUpload) { -%>