use HTML as default in astroid

patch.diff

commit 1553d30965356c68c2fcaac99e2be0ad94d47675
Author: Charlie Allom <[email protected]>
Date:   Thu Nov 9 10:42:52 2017 +0000

    flip
---
 src/chunk.hh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git src/chunk.hh src/chunk.hh
index 97fee4c..3ee3085 100644
--- src/chunk.hh
+++ src/chunk.hh
@@ -52,7 +52,7 @@ namespace Astroid {
         { "html" , g_mime_content_type_new ("text", "html") }
       };
 
-      GMimeContentType * preferred_type = viewable_types["plain"];
+      GMimeContentType * preferred_type = viewable_types["html"];
 
       refptr<Crypto> crypt;