Prepare for v0.6.0

Author: kesmit13

docs/src/whatsnew.rst

@@ -8,6 +8,10 @@ This document outlines features and improvements from each release.
    are for non-production testing and evaluation, and may include
    changes to the API.
 
+v0.6.0 - May 17, 2023
+---------------------
+* Added GSSAPI/Kerberos support
+
 v0.5.4 - March 15, 2023
 -----------------------
 * Added expiration to workspaces