Update ui.js

I saw a typo and it bothered me a lot.
Update README.md
Merge pull request #95 from Explouad/patch-1

Fix typo
Use an SVG badge.

An SVG badge looks better on Retina screens and when zoomed in.
Merge pull request #143 from espadrine/patch-1

Use an SVG badge.
removed double import, causes confusion
Merge pull request #179 from gillesdemey/feature-removed-import

removed double import, causes confusion
Merge pull request #187 from Yify/master

Merge `master` into `dev-0.2.8`