[devhelp] Include dh-enum-types.h in main header

[Sébastien Wilmet <swilmet src gnome org>]

commit 9b7242dfb3cc7f4e5957342d747d68708b9575bf
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Sun Mar 11 11:08:07 2018 +0100

    Include dh-enum-types.h in main header
    
    dh-enum-types.h is part of the public API.

 devhelp/devhelp.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/devhelp/devhelp.h b/devhelp/devhelp.h
index 2acb516..131ad9a 100644
--- a/devhelp/devhelp.h
+++ b/devhelp/devhelp.h
@@ -21,6 +21,8 @@
 
 /* Include all the public headers. */
 
+#include <devhelp/dh-enum-types.h>
+
 #include <devhelp/dh-assistant-view.h>
 #include <devhelp/dh-book.h>
 #include <devhelp/dh-book-manager.h>