Add a changelog

CHANGELOG.md

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+## 1.2.1 (2017-09-15)
+
+* Improve responsiveness
+
+## 1.2.0 (2017-09-15)
+
+### Features
+
+* Patchwork is now a [Progressive web app](https://developers.google.com/web/progressive-web-apps/)
+  and it is installable on your phone's home screen. 📱 
+* We have a [new icon](https://github.com/delaguilaluis/patchwork/blob/master/assets/icon.png)! 🎉 
+
+## 1.1.0 (2017-03-07)
+
+### Features
+
+* Added 4 new tile styles (flat corners)
+* Added a color picker to change the tiles color
+
+### Fixes
+
+* Changed the shape of round borders. Now they look like the quarter of a circle.
+* Changed the order of appearance of styles to follow a clock-wise direction
+
+## 1.0.0 (2017-03-06)
+
+* Basic grid that changes the box borders on click events