Change the naming style of OpenMode.
diff --git a/lib/bcc/FileHandle.h b/lib/bcc/FileHandle.h
index e420f68..02dbe31 100644
--- a/lib/bcc/FileHandle.h
+++ b/lib/bcc/FileHandle.h
@@ -25,8 +25,8 @@
 namespace bcc {
   namespace OpenMode {
     enum ModeType {
-      READ,
-      WRITE
+      Read = 0,
+      Write = 1,
     };
   }