[gmime] Updated README.md

[Rico Tzschichholz <ricotz src gnome org>]

commit c9901d75a1a932dab3f7865a62ac1307f5058e94
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Mon Nov 26 10:17:55 2018 -0500

    Updated README.md

 README.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/README.md b/README.md
index 3faf7386..78e1a07b 100644
--- a/README.md
+++ b/README.md
@@ -210,7 +210,7 @@ an HTML version of the message body that references the sibling video and images
 Now that you have a rough idea of how a message is structured and how to interpret various MIME entities,
 the next step is learning how to traverse the MIME tree using GMime.
 
-### Traversing a MimeMessage
+### Traversing a GMimeMessage
 
 The top-level MIME entity of the message will generally either be a `GMimePart` or a `GMimeMultipart`.