API Review: Don't reorder existing enum values

Inserting things into the middle of an enum breaks backwards
compatibility, so don't do that.

Change-Id: Ie8e2768e8681f0237e7f233f4461f884b4b1b4f9
Reviewed-by: Richard J. Moore <rich@kde.org>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>

src/network/access/qnetworkrequest.h

@@ -87,10 +87,10 @@ public:
         BackgroundRequestAttribute,
         SpdyAllowedAttribute,
         SpdyWasUsedAttribute,
-        HTTP2AllowedAttribute,
-        HTTP2WasUsedAttribute,
         EmitAllUploadProgressSignalsAttribute,
         FollowRedirectsAttribute,
+        HTTP2AllowedAttribute,
+        HTTP2WasUsedAttribute,
 
         User = 1000,
         UserMax = 32767