add changelog

CHANGELOG.md

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+# Change Log
+
+This is the Changelog for the vim-airline project.
+
+## [Unreleased]
+- Changes
+  - Themes have been moved into an extra repository [vim-airline-themes](https://github.com/vim-airline/vim-airline-themes)
+
+## [0.7] - 2014-12-10
+- New features
+    - accents support; allowing multiple colors/styles in the same section
+    - extensions: eclim
+    - themes: understated, monochrome, murmur, sol, lucius
+- Improvements
+    -  solarized theme; support for 8 color terminals
+    -  tabline resizes dynamically based on number of open buffers
+    -  miscellaneous bug fixes
+
+## [0.6] - 2013-10-08
+
+- New features
+    - accents support; allowing multiple colors/styles in the same section
+    - extensions: eclim
+    - themes: understated, monochrome, murmur, sol, lucius
+- Improvements
+    - solarized theme; support for 8 color terminals
+    - tabline resizes dynamically based on number of open buffers
+    - miscellaneous bug fixes
+
+## [0.5] - 2013-09-13
+
+- New features
+    - smart tabline extension which displays all buffers when only one tab is visible
+    - automatic section truncation when the window resizes
+    - support for a declarative style of configuration, allowing parts to contain metadata such as minimum window width or conditional visibility
+    - themes: zenburn, serene
+- Other
+    - a sizable chunk of vim-airline is now running through a unit testing suite, automated via Travis CI
+
+## [0.4] - 2013-08-26
+
+ - New features
+    - integration with csv.vim and vim-virtualenv
+    - hunks extension for vim-gitgutter and vim-signify
+    - automatic theme switching with matching colorschemes
+    - commands: AirlineToggle
+    - themes: base16 (all variants)
+ - Improvements
+    - integration with undotree, tagbar, and unite
+ - Other
+    - refactored core and exposed statusline builder and pipeline
+    - all extension related g:airline_variables have been deprecated in favor of g:airline#extensions# variables
+    - extensions found in the runtimepath outside of the default distribution will be automatically loaded
+
+## [0.3] - 2013-08-12
+
+-  New features
+    -  first-class integration with tagbar
+    -  white space detection for trailing spaces and mixed indentation
+    -  introduced warning section for syntastic and white space detection
+    -  improved ctrlp integration: colors are automatically selected based on the current airline theme
+    -  new themes: molokai, bubblegum, jellybeans, tomorrow
+-  Bug fixes
+    -  improved handling of eventignore used by other plugins
+-  Other
+    - code cleaned up for clearer separation between core functionality and extensions
+    - introduced color extraction from highlight groups, allowing themes to be generated off of the active colorscheme (e.g. jellybeans and tomorrow)
+    - License changed to MIT
+
+## [0.2] - 2013-07-28
+
+-  New features
+      - iminsert detection
+      - integration with vimshell, vimfiler, commandt, lawrencium
+      - enhanced bufferline theming
+      - support for ctrlp theming
+      - support for custom window excludes
+- New themes
+      - luna and wombat
+- Bug fixes
+      - refresh branch name after switching with a shell command
+
+## [0.1] - 2013-07-17
+
+- Initial release
+  - integration with other plugins: netrw, unite, nerdtree, undotree, gundo, tagbar, minibufexplr, ctrlp
+  - support for themes: 8 included
+
+[Unreleased]: https://github.com/vim-airline/vim-airline/compare/v0.7...HEAD
+[0.7]: https://github.com/vim-airline/vim-airline/compare/v0.6...v0.7
+[0.6]: https://github.com/vim-airline/vim-airline/compare/v0.5...v0.6
+[0.5]: https://github.com/vim-airline/vim-airline/compare/v0.4...v0.5
+[0.4]: https://github.com/vim-airline/vim-airline/compare/v0.3...v0.4
+[0.3]: https://github.com/vim-airline/vim-airline/compare/v0.2...v0.3
+[0.2]: https://github.com/vim-airline/vim-airline/compare/v0.1...v0.2
+[0.1]: https://github.com/vim-airline/vim-airline/releases/tag/v0.1