Introduced changelog.

CHANGELOG.md

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+# 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).
+
+## [v1.0.9](https://github.com/TLINDEN/tablizer/tree/v1.0.9) - 2022-10-14
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.8...v1.0.9)
+
+### Added
+
+- Added Changelog file.
+
+### Changed
+
+- some minor changes to satisfy linter.
+
+
+
+## [v1.0.8](https://github.com/TLINDEN/tablizer/tree/v1.0.8) - 2022-10-13
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.7...v1.0.8)
+
+### Added
+
+- Added sort support with the new parameter -k (like sort(1).
+
+
+
+## [v1.0.7](https://github.com/TLINDEN/tablizer/tree/v1.0.7) - 2022-10-11
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.6...v1.0.7)
+
+### Added
+
+- Added pattern highlighting support.
+
+- Added more unit tests.
+
+### Fixed
+
+- Fixed extended more output in combination with -c.
+
+- Fixed issue #4, the version string was missing.
+
+
+
+## [v1.0.6](https://github.com/TLINDEN/tablizer/tree/v1.0.6) - 2022-10-05
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.5...v1.0.6)
+
+### Added
+
+- Added documentation about regexp syntax in the manpage.
+
+- Added more unit tests.
+
+### Changed
+
+- Rewrote the input parser.
+
+- Some more refactoring work has been done.
+
+
+
+## [v1.0.5](https://github.com/TLINDEN/tablizer/tree/v1.0.5) - 2022-10-05
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.4...v1.0.5)
+
+### Added
+
+- A  new option has been  added: --invert-match -v which  behaves like
+  the same option in grep(1): it inverts the pattern match.
+
+- A few more unit tests have been added.
+
+### Fixed
+
+- Pattern  matching did  not work, because  the (new)  help subcommand
+  lead  to  cobra  taking  care  of  the  first  arg  to  the  program
+  (argv[1]).  So now  there's a  new parameter  -m which  displays the
+  manpage and no more subcommands.
+
+
+
+## [v1.0.4](https://github.com/TLINDEN/tablizer/tree/v1.0.4) - 2022-10-04
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.3...v1.0.4)
+
+### Added
+
+- Development version of the compiled binary now uses git vars
+  in addition to program version.
+
+- Added  an option to display  the manual page (compiled  in) as text:
+  --help, for cases where a user just installed the binary.
+
+### Changed
+
+- Fixed go module namespace.
+
+
+
+## [v1.0.3](https://github.com/TLINDEN/tablizer/tree/v1.0.3) - 2022-10-03
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.2...v1.0.3)
+
+### Added
+
+- Added a new output mode: shell mode, which allows the user
+  to use the output in a shell eval loop to further process
+  the data.
+
+### Changed
+
+- More refactoring work has been done.
+
+
+
+## [v1.0.2](https://github.com/TLINDEN/tablizer/tree/v1.0.2) - 2022-10-02
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.1...v1.0.2)
+
+### Added
+
+- Added some basic unit tests.
+
+### Changed
+
+- Code has been refactored to be more efficient.
+
+- Replaced table generation code with Tablewriter.
+
+
+
+
+
+## [v1.0.1](https://github.com/TLINDEN/tablizer/tree/v1.0.1) - 2022-09-30
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/v1.0.0...v1.0.1)
+
+### Added
+
+- Added a unix manual page.
+
+- Added release builder to Makefile
+
+### Changed
+
+- Various minor fixes.
+
+
+
+## [v1.0.0](https://github.com/TLINDEN/tablizer/tree/v1.0.0) - 2022-09-28
+
+[Full Changelog](https://github.com/TLINDEN/tablizer/compare/02a64a5c3fe4220df2c791ff1421d16ebd428c19...v1.0.0)
+
+Initial release.