[clang-tidy] cpp: Turn reference operators to const

Found with cppcoreguidelines-c-copy-assignment-signature

Signed-off-by: Rosen Penev <rosenp@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/plist/Integer.h b/include/plist/Integer.h
index adbc39a..bdabc6f 100644
--- a/include/plist/Integer.h
+++ b/include/plist/Integer.h
@@ -33,7 +33,7 @@ public :
     Integer(Node* parent = NULL);
     Integer(plist_t node, Node* parent = NULL);
     Integer(const Integer& i);
-    Integer& operator=(Integer& i);
+    Integer& operator=(const Integer& i);
     Integer(uint64_t i);
     virtual ~Integer();