Update changelog

CHANGELOG.md

+# 2.0.0 (2015-11-XX)
+## Breaking changes
+- All attributes except `rzSliderModel` and `rzSliderHigh` are moved to `rzSliderOptions`. (See the new documentation in ReadMe)
+
+## Features
+- Add a `rzSliderOptions` attribute to pass options to the slider.
+- Add a `RzSliderOptions.options()` method to set global options.
+- Add a `scale` option to fix sliders displayed in an element that uses `transform: scale(0.5)`.
+- Add a `stepsArray` option (#163)
+- Add an `id` option that is passed to the translate function as second arg (#161)
+
 # 1.1.0 (2015-11-07)
 ## Features
 - Configurable update interval (#153)