Add a change log

Closes #248

CHANGELOG.md

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+# Change Log
+
+All notable changes to this project will be documented in this file. This
+project adheres to [Semantic Versioning](http://semver.org).
+
+## [Unreleased]
+
+[Unreleased]: https://github.com/thoughtbot/bitters/compare/v1.3.2...HEAD
+
+### Added
+
+- Added `text-align: center;` to buttons.
+- Added `width: 100%;` to `select` elements.
+- Added `appearance: none;` to text inputs.
+- Added `height: 100%;` to `html` and `body` elements.
+
+### Removed
+
+- Remove `select[multiple]` selector.
+
+## [1.3.2] - 2016-06-21
+
+### Added
+
+- Added `::placeholder` styles for forms.
+
+### Fixed
+
+- Fixed file permissions on the core Sass files.
+
+### Changed
+
+- Update Bourbon dependency to 5.0.0.beta.6.
+
+[1.3.2]: https://github.com/thoughtbot/bitters/compare/v1.3.1...v1.3.2
+
+## [1.3.1] - 2016-03-04
+
+### Fixed
+
+- Fixed an issue with the Bitters executable which broke using the Bitters CLI
+  to install the Bitters files.
+
+### Changed
+
+- Update Bourbon dependency to 5.0.0.beta.3.
+
+[1.3.1]: https://github.com/thoughtbot/bitters/compare/v1.3.0...v1.3.1
+
+## [1.3.0] - 2016-03-03
+
+### Added
+
+- Added `margin: 0;` to `dl` and `dt` elements in `_lists.scss`.
+- Set global `box-sizing` to `border-box`.
+- Added `figure` styles, setting `margin: 0;`.
+
+### Changed
+
+- Moved Bitters’ core Sass files from the `app/assets/stylesheets/` directory to
+  a `core/` directory.
+- Un-nested `dt` and `dd` elements outside the `dl` declaration
+  in `_lists.scss`.
+- Consolidated input styles and selectors.
+- Increased the font size on headings.
+- Update Bourbon dependency to 5.0.0.beta.1.
+- Changed `$base-font-family` from Helvetica to system fonts.
+- Moved `img` and `picture` styles to a `_media.scss` partial.
+- Changed the `margin-bottom` on `select` elements from `$base-spacing` to
+  `$small-spacing`.
+
+### Removed
+
+- Removed grid settings for [Neat], which includes removal of the following
+  variables:
+  - `$medium-screen-up`
+  - `$large-screen-up`
+  - `$column`
+  - `$gutter`
+  - `$grid-columns`
+  - `$max-width`
+
+[1.3.0]: https://github.com/thoughtbot/bitters/compare/v1.2.0...v1.3.0
+[Neat]: https://github.com/thoughtbot/neat
+
+## [1.2.0] - 2016-01-04
+
+### Added
+
+- Added base `legend` styles.
+
+### Fixed
+
+- Fixed the `select` `multiple` selector syntax.
+
+### Changed
+
+- Darkened the color value of `$blue` to improve contrast.
+- `background-color`, `border`, `margin` and `padding` are now “cleared” on
+  the `fieldset` element.
+- Changed input selectors to be less-specific:
+  - `input[type="search"]` is now `[type="search"]`
+  - `input[type="checkbox"]` is now `[type="checkbox"]`
+  - `input[type="radio"]` is now `[type="radio"]`
+  - `input[type="file"]` is now `[type="file"]`
+
+### Removed
+
+- Removed `font-feature-settings` from `table` and `body`.
+- Removed placeholder selectors for default list styling: `%default-ul`
+  & `%default-ol`.
+- `abbr` elements within `label` elements are no longer hidden.
+- `label`’s with a class of `required` no longer have an `*` inserted via
+  `content` to the `::after` pseudo element.
+- `label` siblings of `input[type="checkbox"]` and `input[type="radio"]`
+  elements are no longer set to `display: inline-block;`.
+
+[1.2.0]: https://github.com/thoughtbot/bitters/compare/v1.1.0...v1.2.0
+
+## [1.1.0] - 2015-08-28
+
+### Added
+
+- Added a `$secondary-background-color` variable.
+- Added `:disabled` styles for text inputs.
+- Added `$base-duration` and `$base-timing` variables.
+- Added `display: inline-block;` to `label` siblings of `input[type="checkbox"]`
+  and `input[type="radio"]` elements.
+
+### Changed
+
+- Swapped `padding-bottom` for `margin-bottom` on the `input[type="file"]`
+  selector.
+- Changed values for the `$max-width`, `$medium-screen` and `$large-screen`
+  variables.
+- Padding on button elements was tweaked.
+
+### Removed
+
+- Dropped support for Sass versions below than 3.4.
+- Dropped support for LibSass versions below than 3.0.
+- Dropped support for Bourbon versions below than 4.2.
+- Removed prefixes for `appearance` and `font-feature-settings`.
+- Removed `-webkit-font-smoothing` on `body`.
+- Removed `outline: none;` on `:active` and `:focus` on `a` elements.
+
+[1.1.0]: https://github.com/thoughtbot/bitters/compare/v1.0.0...v1.1.0