title: Proxy URL not working with BrowserSync Gulp task
body: <p>Can someone tell me why my proxy URL isn't working with BrowserSync and Gulp? Instead, it just keeps using <a href="http://localhost:3000" rel="noreferrer">http://localhost:3000</a> as the dev URL.</p>
  
  <pre><code>gulp.task('watch', ['bs'], function() {
    gulp.watch('scss/*.scss', ['scss', browserSync.reload]);
  });
  
  gulp.task('bs', function() {
      browserSync.init(['css/style1.css', 'css/style2.css'], {
        proxy: 'dev.site.com'
      });
  });
  
  gulp.task('default', ['scss', 'watch']);
  </code></pre>