Add a changelog

CHANGELOG.md

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+# Changelog
+
+## Unreleased
+
+Fixes:
+
+ * Fixed various warnings on MSVC. ([#60])
+ * Fixed an occurrence of arithmetic overflow.
+ * Fixed a bug in command-line argument parsing.
+
+Improvements:
+
+ * Memory usage has been reduced. ([#148], [#156], [#213])
+ * A fuzzing target has been added.
+ * `--` can now be used to stop parsing command-line arguments.
+ * Builds are now tested on Travis CI and Appveyor. ([#136], [#191])
+ * Improved error messages.
+ * Improved build instructions.
+
+## v1.0.1
+
+Released 2017-03-21.
+
+Fixes:
+
+ * Fixed yet another crash for small images. ([#38])
+ * Makes metadata handling consistent. ([#100])
+ * Fixed some incorrect error messages. ([#40])
+ * Fixed various build issues (a.o. removes the gflags dependency).
+ * Add missing documentation.
+
+Improvements:
+
+ * Adds memory limit support. ([#75])
+
+## v1.0
+
+Released 2017-03-15.
+
+Fixes:
+
+ * Fixed two crashes. ([#29] and `5de9ad8`)
+ * Made memory requirements more explicit.
+
+## v0.2
+
+Released 2017-01-17.
+
+Fixes:
+
+ * The same filename can now be used for input and output. ([#20])
+ * Various compilation issues were fixed. ([#12], [#14])
+ * Fixed a crash on Windows due to usage of uninitialized memory. ([#23])
+
+Improvements:
+
+ * 64-bit binaries for Windows are now released.
+
+## v0.1
+
+Released 2016-12-21.
+
+Fixes:
+
+ * Fixed generated jpegs which some viewers were unable to open. ([#1])
+ * Fixed the build system for Windows.
+
+## v0
+
+Released 2016-10-21.
+
+Initial release.
+
+<!-- Note that some of these are PRs, but GitHub will redirect anyway. -->
+[#1]:   https://github.com/google/guetzli/issues/1
+[#12]:  https://github.com/google/guetzli/issues/12
+[#14]:  https://github.com/google/guetzli/issues/14
+[#20]:  https://github.com/google/guetzli/issues/20
+[#23]:  https://github.com/google/guetzli/issues/23
+[#29]:  https://github.com/google/guetzli/issues/29
+[#38]:  https://github.com/google/guetzli/issues/38
+[#40]:  https://github.com/google/guetzli/issues/40
+[#60]:  https://github.com/google/guetzli/issues/60
+[#75]:  https://github.com/google/guetzli/issues/75
+[#100]: https://github.com/google/guetzli/issues/100
+[#136]: https://github.com/google/guetzli/issues/136
+[#148]: https://github.com/google/guetzli/issues/148
+[#156]: https://github.com/google/guetzli/issues/156
+[#191]: https://github.com/google/guetzli/issues/191
+[#213]: https://github.com/google/guetzli/issues/213