Add CHANGELOG to the project

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+## [1.3.0] - 2019-01-20
+### Added
+- Alias arguments functionality
+- luacov support (with cluacov)
+- README: Codecov version badge, alias arguments functionality
+
+### Changed
+- Switch to LuaJIT instead of pure Lua
+- Improve `path_join` helper function
+
+## [1.2.0] - 2018-12-23
+### Added
+- Recursive config file search functionality
+- README: nomenclature section, LuaRocks version badge, list functionality
+
+### Changed
+- Switch to LuaJIT instead of pure Lua
+- Improve `path_join` helper function
+
+## [1.1.0] - 2018-12-10
+### Added
+- List all aliases functionality
+- `core` module tests
+- Travis-CI support
+
+### Changed
+- README: asciicast, badges
+
+## [1.0.0] - 2018-12-07
+### Added
+- First usable version of the project
+