[gmime] Updated PORTING

[Jeffrey Stedfast <fejj src gnome org>]

commit bdc2046506218041ce9366b22752c2a1c18e7caf
Author: Jeffrey Stedfast <jestedfa microsoft com>
Date:   Sun Feb 5 21:27:27 2017 -0500

    Updated PORTING

 PORTING |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/PORTING b/PORTING
index dcdee3f..68e951d 100644
--- a/PORTING
+++ b/PORTING
@@ -50,6 +50,8 @@ Porting from GMime 2.6 to GMime 3.0
 - Renamed g_mime_gpg_context_[get,set]_always_trust() to
   g_mime_crypto_context_[get,set]_always_trust().
 
+- Removed g_mime_gpg_context_[get,set]_use_agent(). This should no longer be needed.
+
 
 Porting from GMime 2.4 to GMime 2.6
 -----------------------------------