fix compiler warning
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index 0289a13..2d3a1f7 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -1967,6 +1967,8 @@
             _entityFlag[ (int)entities[i].value ] = true;

         }

     }

+    // Clang doesn't like indexing arrays with 'char'

+    // so cast to int. (Looks strange.)

     _restrictedEntityFlag[(int)'&'] = true;

     _restrictedEntityFlag[(int)'<'] = true;

     _restrictedEntityFlag[(int)'>'] = true;	// not required, but consistency is nice