[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/Key.h b/include/plist/Key.h
index e75aabc..bd5f7bc 100644
--- a/include/plist/Key.h
+++ b/include/plist/Key.h
@@ -34,7 +34,7 @@ public :
     Key(Node* parent = NULL);
     Key(plist_t node, Node* parent = NULL);
     Key(const Key& k);
-    Key& operator=(Key& k);
+    Key& operator=(const Key& k);
     Key(const std::string& s);
     virtual ~Key();