Fix build warning from gcc about std::copy

Author: jbeder

include/yaml-cpp/binary.h

@@ -34,7 +34,7 @@ class YAML_CPP_API Binary {
       m_data.swap(rhs);
       rhs.clear();
       rhs.resize(m_unownedSize);
-      std::copy(m_unownedData, m_unownedData + m_unownedSize, &rhs[0]);
+      std::copy(m_unownedData, m_unownedData + m_unownedSize, rhs.begin());
       m_unownedData = 0;
       m_unownedSize = 0;
     } else {