renamed pybind11::set::insert -> add to match C api naming

example/example2.cpp

@@ -30,8 +30,8 @@ public:
     /* Create and return a Python set */
     py::set get_set() {
         py::set set;
-        set.insert(py::str("key1"));
-        set.insert(py::str("key2"));
+        set.add(py::str("key1"));
+        set.add(py::str("key2"));
         return set;
     }
 

include/pybind11/pytypes.h

@@ -337,7 +337,7 @@ public:
     PYBIND11_OBJECT(set, object, PySet_Check)
     set() : object(PySet_New(nullptr), false) { }
     size_t size() const { return (size_t) PySet_Size(m_ptr); }
-    void insert(const object &object) { PySet_Add(m_ptr, (PyObject *) object.ptr()); }
+    void add(const object &object) { PySet_Add(m_ptr, (PyObject *) object.ptr()); }
     void clear() { PySet_Clear(ptr()); }
 };