Extend TypeError exception with details of merged object for dict

Change-Id: I4b160d0fbb02ced3907cff79be4cc6bd7d133d07
diff --git a/requirements.txt b/requirements.txt
index 6345082..1f5c522 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,3 +3,4 @@
 six>=1.9.0
 cookiecutter
 jinja2==2.8.1
+mock>=1.2
\ No newline at end of file