message: Add license badge to README
diff: -# Embla Carousel
  +# Embla Carousel &middot; ![GitHub](https://img.shields.io/github/license/davidcetinkaya/embla-carousel.svg?color=blue)
  Embla is a lightweight carousel plugin for the web with no dependencies. It's 100% open source and free to use on both personal and commercial projects. Use it with the module bundler of your choice or by manually injecting the script.
  @@ -101,10 +101,10 @@ Allow mouse and touch interactions to move the carousel.
  **`loop`** (boolean)
  Determines if the carousel should loop when start or end is reached.
  -**`mass`** (number)
  +**`mass`** (number: 1.5 - 3)
  Simulates how heavy the carousel is. A higher number will add more wiggle effect.
  -**`speed`** (number)
  +**`speed`** (number: 5 - 20)
  Carousel speed when using buttons to navigate. A higher number will make transitions faster. Pointer events are not affected by this.
  **`startIndex`** (number)
  @@ -149,4 +149,4 @@ Works just like the native addEventListener but Embla will store this event for
  ## License
  -[MIT license](http://opensource.org/licenses/MIT)
  +Embla is [MIT licensed](http://opensource.org/licenses/MIT).
  