Update .gitignore

Change-Id: I116aaf2ccc4ce6a68cff19ee5ed785bcfacccad5
Signed-off-by: Matthew Barth <msbarth@us.ibm.com>
diff --git a/.gitignore b/.gitignore
index b0baa5d..cf6039d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,8 @@
 *.sw*
 phosphor-inventory
 generated.cpp
+gen_serialization.hpp
+test/gen_serialization.hpp
 xyz.openbmc_project.Example.*.cpp
 xyz/openbmc_project/Example/
 Makefile