Add a changelog

Gonna try and keep this up to date as often as possible.

CHANGELOG.md

+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
+and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [2.0.1] - 10/11/2017
+### Added
+- initial installer script
+- gitter.im badge in readme
+- 32bit cross compiling support on 64bit linux
+- added support for GNUInstallDirs to cmake
+- Include new translations from transifex
+- Added WxWidgets ABI compiler check
+- Add linux Joystick reference to issue template
+- Add #ubckyde <cmath> fir std::cell()
+- 
+
+### Changed
+- Fix 2xSaImmx.asm linking issue
+- cmake: default to ENABLE_ASM_CORE=OFF
+- libretro merging from upstream libretro fork.
+- better fix for clipped video in GL Fullscreen.
+- Fix flibc crash: add log message on fopen failure
+- fix gameboy header-detection in libretro interface
+- hotfix for potential buffer-overflow
+- delete memory in common/array.h on destruction
+- SDL: improve error msg for unwritable config
+- SDL: fix deflt bat saving, improve dir checking
+- fix portability issue with strerror_r()
+- Windows doesn't have sterror_r
+- wx/wxvbam: fix GetAbsolutePath 
+- fix a memory leak due to wrong syntax
+- regenerate translation files
+- fix errors reported by SUSE's post build linter
+- SUSE Lint: fix a few classes of warnings
+- let cmake escape -D preproc. definitions
+- fix memory viewer xrc on wx 3.1+
+- Improving README
+- SoundSDL: lock conditional code cleanup
+- remove the default F11 keybinding for save state
+- hopefully fix resize artifacts on game panel
+- soundSDL: write silence when paused
+- cleanup SoundSDL  #139 #130 #97 #67 #65 #46 #47
+- document how to provice symbolic backtraces
+- "no throttle" fixes/cleanup
+- only use -mtune=generic on x86/amd64
+- installdeps: use -j$(nproc) not -j8 in info
+- use -fabi-version=2 for GCC turn off LTO
+- installdeps: minor refactoring/cleanup
+- improve Wx GCC ABI check
+- minor improvements for Wx Compile tests
+- fix wx ABI check for Win32/MinGW
+- installdeps: fedora fixes, including m32
+- cmake: wx and cross compiling fixes
+- restore wx 2.7 compat, improve string processing
+- rename CMakeScripts/ to cmake/
+- work around gcc lto wrappers bug with gcc 7.x
+- update README.md
+- remove doctoc title from README.md TOC
+- improve win32 dependencies git submodule handling
+- use num cpu cores to parallelize LTO link with gcc
+- fix huge app icon in Win volume settings
+- fix deadlock in SoundSDL:deinit()
+- added executable extension for sdl binary
+- default LTO to off on 64bit MinGW
+- minor code cleanup
+- deps: dont check result of apt-get update 
+- read version and subversion info from Git
+- fix error and version info in shallow git clones
+- refactor/cleanup GitTagVersion.cmake
+
+### Removed
+- Cairo Renderer: it never performed well to begin with
+
+
+
+[2.0.1]: https://github.com/olivierlacan/keep-a-changelog/compare/throttle...v2.0.1
+