Adding upstream version 1.2.3.

Signed-off-by: Daniel Baumann <daniel@debian.org>

CHANGELOG.md

@@ -0,0 +1,40 @@
+## [v1.2.3] - 2021-01-13
+
+- Fix security issues in dependencies; CVE-2020-16845, CVE-2019-11840, CVE-2020-14040 (Thanks to [@bhamail](https://github.com/bhamail)).
+
+## [v1.2.2] - 2020-04-10
+
+- Update `go-github` dependency to v30.1.0
+
+## [v1.2.1] - 2019-12-19
+
+- Fix `.tgz` file was not handled as `.tar.gz`.
+
+
+## [v1.2.0] - 2019-12-19
+
+- New Feature: Filtering releases by matching regular expressions to release names (Thanks to [@fredbi](https://github.com/fredbi)).
+  Regular expression strings specified at `Filters` field in `Config` struct are used on detecting the
+  latest release. Please read [documentation](https://godoc.org/github.com/rhysd/go-github-selfupdate/selfupdate#Config)
+  for more details.
+- Allow `{cmd}_{os}_{arch}` format for executable names.
+- `.tgz` file name suffix was supported.
+
+
+## [v1.1.0] - 2018-11-10
+
+- New Feature: Signature validation for release assets (Thanks to [@tobiaskohlbau](https://github.com/tobiaskohlbau)).
+  Please read [the instruction](https://github.com/rhysd/go-github-selfupdate#hash-or-signature-validation) for usage.
+
+
+## [v1.0.0] - 2018-09-23
+
+First release! :tada:
+
+
+[v1.2.3]: https://github.com/rhysd/go-github-selfupdate/compare/v1.2.2...v1.2.3
+[v1.2.2]: https://github.com/rhysd/go-github-selfupdate/compare/v1.2.1...v1.2.2
+[v1.2.1]: https://github.com/rhysd/go-github-selfupdate/compare/v1.2.0...v1.2.1
+[v1.2.0]: https://github.com/rhysd/go-github-selfupdate/compare/go-get-release...v1.2.0
+[v1.1.0]: https://github.com/rhysd/go-github-selfupdate/compare/v1.0.0...v1.1.0
+[v1.0.0]: https://github.com/rhysd/go-github-selfupdate/compare/example-1.2.4...v1.0.0