Update .coveragerc
diff --git a/.coveragerc b/.coveragerc
index 77c5f39..0aa4957 100644
--- a/.coveragerc
+++ b/.coveragerc
@@ -5,6 +5,7 @@
     *__init__*
     *__main__*
     ec2stack/configure.py
+    ec2stack/secretkey_manager.py
 
 [report]
 exclude_lines =