Removed forgotten use Devel::StackTrace

I have no idea how it got there
v0.8.2

 - Released: 2014-09-10 12:00:06 UTC

 [BUG FIXES]
 - Removed forgotten use of Devel::StackTrace

 [STATISTICS]
 - code churn: 1 file changed, 1 insertion(+), 1 deletion(-)
Build results of 6260619 (on master)