docs: Add changelog

Moved the version info in top of readme to a changelog. Converted the
version identifiers to more semantic versioning, but it is easy to
change if semantic versioning is not interesting, or my conversion
doesn't make sense.

CHANGELOG.md

@@ -0,0 +1,17 @@
+# Change Log
+
+## [0.1.4] - 2012-11-24
+### Added
+* KTX file format
+* Basic ETC1 support
+* Simple makefile
+
+### Fixed
+* Various DDS format fixes
+
+## [0.1.3] - 2012-04-26
+### Added
+* Ported to Linux (tested on Ubuntu x86 w/Codeblocks). Note that a few features of the cmd line tool don't work yet (eg. -timestamp)
+
+[0.1.4]: https://github.com/BinomialLLC/crunch
+[0.1.3]: https://github.com/BinomialLLC/crunch