Add a changelog

CHANGELOG.md

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+# Changelog
+
+## 0.6.0 (unreleased)
+
+### New features
+
+* An array of functions can now be as the value of `converter` property,
+  so that multi-argumnet options can use different conversion rules
+  for different arguments (#14).
+* Mutexes can now include positional arguments (#11).
+
+## 0.5.0 (2015-12-09)
+
+### New features
+
+* Actions can now be used to implement custom processing logic.
+* Added actions for arguments.
+* Added string aliases for actions such as `store_false`.
+* Command actions are now called after the parsing, with result target
+  as the argument.
+* Added `command_target` property for storing name of used command.
+
+### Improvements
+
+* Improved error messages on missing arguments.
+* `-f123` is now interpreted as `-f 123` when `-f` takes an optional argument.
+
+## 0.4.1 (2015-08-08)
+
+### Miscellaneous
+
+* Added license header to `argparse.lua` for ease of bundling
+  and packaging (#3).
+
+## 0.4.0 (2015-06-20)
+
+### Breaking changes
+
+* Removed `aliases` property, aliases can now be set using several space
+  separated strings as name, or, as it was possible before, by setting `name`
+  property several times.
+
+### New features
+
+* Added `handle_options` property (#2).
+* Often used properties now can be passed as arguments when calling or
+  constructing an element.
+
+### Improvements
+
+* Cleaned up trailing whitespace in generated messages.
+
+## 0.3.2 (2015-01-15)
+
+### Miscellaneous
+
+* Argparse no longer bundles 30log.
+
+## 0.3.1 (2014-11-06)
+
+### Fixes
+
+* Fixed incompatibility with old Luarocks versions.
+
+## 0.3.0 (2014-08-25)
+
+### New features
+
+* New `show_default` field disables automatic indication of default values in
+  help messages.
+
+### Improvements
+
+* In default targets `-` is now replaced with `_`.
+* Changed usage message generation to show options taking variable number of
+  arguments after positional arguments.
+
+### Fixes
+
+* Fixed incompatibility with strict.lua and other checkers (#1).
+
+## 0.2.0 (2014-03-09)
+
+### New features
+
+* Added mutually exclusive groups.
+* Options and arguments can now be configured to use different argument
+  placeholders for first, second, etc. arguments. E.g. `--pair <key> <value>`.
+
+### Fixes
+
+* Fixed script name inference not working for `Parser:get_help()` and
+  `Parser:get_usage()` methods.
+
+## 0.1.0 (2014-03-02)
+
+Initial release.