IPC::Cmd is no longer needed
Checking in changes prior to tagging of version 1.4.4.

Changelog diff is:

diff --git a/Changes b/Changes
index f133af3..5a46f1f 100644
--- a/Changes
+++ b/Changes
@@ -1,5 +1,11 @@
 Revision history for Perl extension App::plenv

+1.4.4 2013-03-10T10:53:22
+
+    - Updated deps for Devel::PatchPerl and Perl::Build.
+      Latest version of Devel::PatchPerl removes deps for IPC::Cmd!
+      (tokuhirom)
+
 1.4.1 2013-02-07T11:50:56

     - bundle IPC::Cmd