Release notes for 1.8.8

RELEASE-NOTES.md

@@ -4,6 +4,7 @@ ZeroTier Release Notes
 # 2022-04-11 -- Version 1.8.8
 
  * Fix a local privilege escalation bug in the Windows installer.
+ * Dependency fix for some Ubuntu versions.
  * No changes for other platforms. Windows upgrade recommended, everyone else optional.
 
 # 2022-03-30 -- Version 1.8.7