Create CHANGELOG.md and add change log for v0.2.8

CHANGELOG.md

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+# Change Log
+
+## [v0.2.8](https://github.com/mattanger/ckb-next/tree/v0.2.8) (2017-05-06)
+[Full Changelog](https://github.com/mattanger/ckb-next/compare/v0.2.7...v0.2.8)
+
+- `ckb` is now `ckb-next`, __but the binaries will be renamed in `v0.2.9`__
+- Releases and release notes are provided from now on [\#10](https://github.com/mattanger/ckb-next/issues/10) [\#66](https://github.com/mattanger/ckb-next/issues/66)
+- Numerous PRs from `ckb` merged [\#4](https://github.com/mattanger/ckb-next/issues/4)
+- SIGSEGV when deleting copied profile is fixed [\#38](https://github.com/mattanger/ckb-next/issues/38)
+- Modifier keys not working on macOS Sierra are temporarily fixed [\#29](https://github.com/mattanger/ckb-next/issues/29)
+- Compilation errors on macOS Sierra are fixed [\#134](https://github.com/mattanger/ckb-next/issues/134)
+- `make debug` target on Linux is fixed [\#79](https://github.com/mattanger/ckb-next/issues/79)
+- Heat map animation issues fixed [\#30](https://github.com/mattanger/ckb-next/issues/30)
+- Compilation of the music visualizer fixed [\#21](https://github.com/mattanger/ckb-next/issues/21)
+- Hardware profile loading error on firmware 2.05 fixed [\#24](https://github.com/mattanger/ckb-next/pull/24)
+- Project's own firmware table created, signed and populated with new devices [\#60](https://github.com/mattanger/ckb-next/pull/60)
+- Arch Linux and Fedora/CentOS packages added [\#80](https://github.com/mattanger/ckb-next/pull/80) [\#5](https://github.com/mattanger/ckb-next/issues/5) [\#41](https://github.com/mattanger/ckb-next/pull/41)