CHANGELOG.md: update v0.22.1 release date

It was delayed due to last minute CI issues

Change-Id: If2e801b9c849f1df70349f70b30dfd98af257c64
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/290391
Trust: Hyang-Ah Hana Kim <[email protected]>
Run-TryBot: Hyang-Ah Hana Kim <[email protected]>
TryBot-Result: kokoro <[email protected]>
Reviewed-by: Rebecca Stambler <[email protected]>

Author: hyangah

CHANGELOG.md

@@ -1,4 +1,4 @@
-## v0.22.1 - 4th Feb, 2021
+## v0.22.1 - 8th Feb, 2021
 
 ### Enhancements
 - Added error details to automated error reports. ([CL 287952](https://go-review.googlesource.com/c/vscode-go/+/287952))
@@ -12,6 +12,9 @@
 ### Code Health
 - Bumped `ini` to 1.3.8 to address a vulnerability report from `npm audit`.
 
+### Thanks
+Thank you for your contribution, @stamblerre, @hyangah, @patrasap0908!
+
 ## v0.22.0 - 26th Jan, 2021
 
 - The language server, `gopls`, is enabled by default. ([Issue 1037](https://github.com/golang/vscode-go/issues/1037))