Optimise images (53 KB reduction)

Hi, 0xced.

I've taken the liberty of putting UIKit-Artwork-Extractor's image assets though a range of optimisation tools. Image optimisation allows us to reduce the footprint of images - meaning faster load times at no cost to image quality. It does this by finding the best (lossless) compression parameters, stripping embedded comments, and removing unnecessary colour profiles. [See more](http://port3000.co.uk/imageoptimiser-a-github-bot-to-proactively-op).

I found 20 optimisable images, making a 53 KB reduction in size. That's about 30.71% of your total image assets.

Merry Christmas.

<table><tr><th>Name</th><th>Reduction</th></tr><tr><td>Artwork.png</td><td>13.67%</td></tr><tr><td>Artwork@2x.png</td><td>16.87%</td></tr><tr><td>Checkerboard.png</td><td>44.90%</td></tr><tr><td>Emoji.png</td><td>20.83%</td></tr><tr><td>Emoji@2x.png</td><td>18.34%</td></tr><tr><td>GlossyButton.png</td><td>18.97%</td></tr><tr><td>GlossyButton@2x.png</td><td>19.40%</td></tr><tr><td>IPA.png</td><td>43.54%</td></tr><tr><td>IPA@2x.png</td><td>32.31%</td></tr><tr><td>Icon.png</td><td>23.13%</td></tr><tr><td>Icon@2x.png</td><td>18.31%</td></tr><tr><td>UITintedGlassButtonHighlight@2x.png</td><td>49.39%</td></tr><tr><td>UITintedGlassButtonMask@2x.png</td><td>64.49%</td></tr><tr><td>UITintedGlassButtonShadow@2x.png</td><td>37.63%</td></tr><tr><td>Unknown.png</td><td>55.24%</td></tr><tr><td>Unknown@2x.png</td><td>68.69%</td></tr><tr><td>Artwork.png</td><td>28.71%</td></tr><tr><td>Emoji.png</td><td>26.56%</td></tr><tr><td>GlossyButton.png</td><td>42.04%</td></tr><tr><td>UISwitch.png</td><td>28.70%</td></tr></tr></table>

Tools used: advpng, gifsicle, jpegoptim, jpegrescan, jpegtran, optipng, pngcrush, pngout. This is an automated bot maintained by [@skattyadz](https://twitter.com/skattyadz)