Add CHANGELOG

CHANGELOG.md

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+# 2.0.0
+
+## New features
+
+- Install with Bower: `bower install readmore`
+- Blocks can now be toggled programmatically: `$('article:nth-of-type(3)').readmore('toggle')`
+- ARIA semantics describe expanded state and relationship between blocks and their toggles
+- Blocks are now assigned an ID if they don't already have one
+- Install development dependencies with NPM
+- Gulp task to minifiy with UglifyJS 
+
+## Improvements
+
+- Height calculations on window resize are "debounced", resulting in more efficient rendering
+- Height calculation in general has been improved
+- The value of the `expanded` argument passed to the `beforeToggle` callback now correctly reflects the _pre-toggle_ state
+- Multiple instances are now fully supported: e.g. `$('article').readmore({speed: 200})` and `$('fieldset').readmore({speed: 900})` will work on the same page
+- Fully responsive, plugin now prefers max-heights set in CSS, even inside media queries
+
+## Potentially breaking changes
+
+- `maxHeight` option is now `collapsedHeight`
+- `sectionCSS` option is now `blockCSS`
+- `toggleSlider()` method is now just `toggle()`
+- Animation is now performed with CSS3 transitions, rather than `jQuery.animate()`
+- IE 8 and 9 are no longer supported, because those browsers hate kittens
+- `init()` is now called within a `window.onload` event handler, which can briefly delay collapsing content
+- `setBoxHeight()` is now a "private" method called `setBoxHeights()`
+- `resizeBoxes()` is also now private
+- Readmore.js now uses attribute selectors, rather than classes
+    - The `.readmore-js-section` and `.readmore-js-toggle` classes are gone
+    - The `expandedClass` and `collapsedClass` options are also gone
+    - Every Readmore.js block needs an ID, if one is not already present, one will be generated 
+
+
+