[gitg/wip/albfan/libgit2-0.28] Bump libgit2 to version 0.28

[Alberto Fanjul <albfan src gnome org>]

commit f3314628c9a2e52eebb9c600b179dd0b5d5e1b74
Author: Alberto Fanjul <albertofanjul gmail com>
Date:   Wed Jul 24 18:32:27 2019 +0000

    Bump libgit2 to version 0.28

 org.gnome.gitgDevel.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/org.gnome.gitgDevel.json b/org.gnome.gitgDevel.json
index 08acddb2..bdd09a21 100644
--- a/org.gnome.gitgDevel.json
+++ b/org.gnome.gitgDevel.json
@@ -63,7 +63,7 @@
                 {
                     "type" : "git",
                     "url" : "https://github.com/libgit2/libgit2.git";,
-                    "branch" : "maint/v0.27"
+                    "branch" : "maint/v0.28"
                 }
             ]
         },