docs: add changelog for 0.13.1

CHANGELOG.md

@@ -1,3 +1,21 @@
+## [0.13.1](https://github.com/typestack/class-validator/compare/v0.13.0...v0.13.1) (2021-01-14)
+
+### Added
+
+- optional mather function has been added to the `ArrayUnique` decorator
+
+### Fixed
+
+- a typo was fixed in the error message generated by the `IsUUID` decorator
+- calling `ValidationError.toString()` doesn't result in an error when `forbidNonWhitelisted` parameter was used
+- fixed typo in error message generated by `IsIn` decorator
+- the `@types/validator` package is correctly installed
+- `inlineSources` option is enabled in tsconfig preventing various sourcemap errors when consuming the package
+
+### Changed
+
+- various dev dependencies has been updated
+
 ## [0.13.0](https://github.com/typestack/class-validator/compare/v0.12.2...v0.13.0) (2021-01-11)
 
 ### Added