Add attribution for recent patches to the history file.

Author: dhellmann

docs/en/history.rst

@@ -8,6 +8,9 @@ dev
   - Fix problem with argument processing in lsvirtualenv under zsh
     (:bbissue:`86`). Thanks to Nat Williams (:bbuser:`natw`) for the
     bug report and patch.
+  - If WORKON_HOME does not exist, create it. Patch from Carl Karsten
+    (:bbuser:`CarlFK`). Test updates based on patches from Matt Austin
+    (:bbuser:`maafy6`) and Hugo Lopes Tavares (:bbuser:`hltbra`).
 
 2.6.3