Update release notes

Signed-off-by: Yukai Huang <yukaihuangtw@gmail.com>

public/docs/release-notes.md

@@ -1,6 +1,48 @@
 Release Notes
 ===
 
+<i class="fa fa-tag"></i> 2.3.0 Isoetes taiwanensis <i class="fa fa-clock-o"></i> 2020-12-30
+---
+
+<div style="text-align: center; margin-bottom: 1em;">
+  <img src="https://upload.wikimedia.org/wikipedia/commons/4/4a/%E5%8F%B0%E7%81%A3%E6%B0%B4%E9%9F%AD.JPG" width="600">
+  <small style="display: block;">Isoetes taiwanensis</small>
+</div>
+
+> Isoetes taiwanensis is a species of plant in the family Isoetaceae. It is endemic to Taiwan, and the only species of quillwort there. As other quillworts, it is relatively small, with erect leaves 7–24 cm (2.8–9.4 in) long. It grows submersed in shallow ponds for most of the year. IUCN considers it critically endangered because of habitat loss.
+> \- Wikipedia [Isoetes taiwanensis](https://en.wikipedia.org/wiki/Isoetes_taiwanensis)
+
+In this release, we focus on polishing existing features, fixing bugs and patching security issues.
+
+We continue to expand the APIs. CodiMD now supports ["Update note's content" and "delete note"](https://github.com/hackmdio/codimd/pull/1559) RESTful APIs. Thanks for the great works from [@JamesCamel](https://github.com/JamesCamel) :heart_eyes:
+
+We also fix several XSS security issues, including [mermaid](https://github.com/hackmdio/codimd/pull/1633), [vega](https://github.com/hackmdio/codimd/pull/1637) and [image lightbox](https://github.com/hackmdio/codimd/pull/1632). We appreciate the security report from [@msrkp](https://github.com/@msrkp), [@Alemmi](https://github.com/Alemmi), and [@nename0
+](https://github.com/nename0).
+
+This is the last release before the end of this year.
+Merry Christmas to everyone! Let's look forward and see you in the next year. :tada:
+
+[Check out the complete release note][v2_3_0]. Thank you CodiMD community and all our contributors. ❤️
+
+[v2_3_0]: https://hackmd.io/@codimd/release-notes/%2F%40codimd%2Fv2_3_0
+
+### Enhancements
+
+- Fretboard improvements
+- Update and delete note api
+- Allow Sequelize CLI to use options set in config.json
+- Allow specifying option for graphviz
+- Spellcheck: add en_GB dictionary
+
+### Fixes
+
+- Fix ui-edit and ui-both buttons in night mode
+- Don't run jsonlint on .vscode jsonc files
+- Fix image lightbox xss issue
+- Fix mermaid xss issue
+- Check upload image mime type
+- Vega syntax XSS dependencies
+
 <i class="fa fa-tag"></i> 2.2.0 Diploderma swinhonis <i class="fa fa-clock-o"></i> 2020-07-20
 ---