Checking in changes prior to tagging of version 0.64.

Changelog diff is:

diff --git a/Changes b/Changes
index 2cfd39d..087b510 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,8 @@
 Revision history for App-gh

+0.64
+    - Fix the `clone` command.
+
 0.63
     - Fix and update the `update` command.