chore: add changelog (#33)

CHANGELOG.md

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+# Change Log
+
+## 2.0.0 - 2023-02-18
+
+### Added
+
+- Added `gh-advisory-lib` client to download the GitHub Security Advisories.
+- `nvd-lib` and `vulnz` now support parameters: `virtualMatchString`, `versionStart`, `versionStartType`, `versionEnd`, and `versionEndType` (See [#16](https://github.com/jeremylong/vuln-tools/issues/16) and [#17](https://github.com/jeremylong/vuln-tools/issues/17)). 
+- `nvd-lib` and `vulnz` now support the boolean parameter `noRejected` (see [#15](https://github.com/jeremylong/vuln-tools/issues/15)).
+
+### Changed
+
+- **Breaking Change** - all instances of `LocalDateTime` have been replaced with `ZonedDateTime`.
+
+## 1.0.1 - 2023-01-23
+
+### Fixed
+
+- Resolves issue with null results from the NVD API (issue #20).
+
+## 1.0.0 - 2022-11-28
+
+- Initial Release.