docs(CHANGELOG.md): add

Author: sciborrudnicki

CHANGELOG.md

@@ -0,0 +1,27 @@
+
+# Change Log
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## [4.2.0] - 2021-06-25
+  
+### Added
+
+- [`a6b567f`](https://github.com/angular-package/type/commit/a6b567f32a00726d2b7ecf38ce7a57a42366aaf6)
+  New `NumberBetween` and `StringOfLength` type.
+
+- [21f3f48]: https://github.com/angular-package/type/commit/21f3f48029d79e1dfd4507d3a684ec1e81e44713
+  `isDate()`, `isFalse()`, `isNumberBetween()`, `isRegExp()`, `isStringLength()`, `isTrue()` with tests and types.
+
+### Changed
+
+- [`e70b034`](https://github.com/angular-package/type/commit/e70b034934b81b3af6ab1976153cbbad8c148f78)
+  All types description in the `README.md`.
+
+- [`61e9376`](https://github.com/angular-package/type/commit/61e93766fab7d72cafa70da712f296c6ca6e9304)
+  Add possibility to use `is` prefixed functions directly from the `guard` eg. `guard.array()`.
+
+### Fixed