catch exceptions as const

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ic8e6ade739bd5ea6e79cac6b9bb2b182748e10c8
diff --git a/elog_serialize.cpp b/elog_serialize.cpp
index a8b4852..3538bd8 100644
--- a/elog_serialize.cpp
+++ b/elog_serialize.cpp
@@ -125,7 +125,7 @@
         }
         return false;
     }
-    catch (cereal::Exception& e)
+    catch (const cereal::Exception& e)
     {
         log<level::ERR>(e.what());
         fs::remove(path);