Update release note

Author: Yukaii

CHANGELOG.md

@@ -1,9 +1,3 @@
 # Change Log
 
-All notable changes to the "vscode-hackmd" extension will be documented in this file.
-
-Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
-
-## [Unreleased]
-
-- Initial release
+[Checkout the complete changelog](https://hackmd.io/@docs/vscode-hackmd-release-notes)

README.md

@@ -32,6 +32,17 @@ Use the same [HackMD](https://hackmd.io) markdown right in VSCode!
 
 [release-notes]: https://hackmd.io/@docs/vscode-hackmd-release-notes
 
+### 1.1.1
+
+#### Added
+
+- HackMD Snippets command
+  - Use command: `HackMD: Create a code snippet` to create a code snippet on HackMD from selected text range
+
+#### Fixed
+
+- Activity icon it not shown ([#23](https://github.com/hackmdio/vscode-hackmd/issues/23))
+
 ### 1.1.0
 
 #### Added