[shotwell] flatpak: Add libchamplain

[Jens Georg <jensgeorg src gnome org>]

commit 6af10224e346ade7a7ad029b2e28faa41bb29293
Author: Jens Georg <mail jensge org>
Date:   Sat Feb 23 20:54:37 2019 +0100

    flatpak: Add libchamplain

 flatpak/org.gnome.Shotwell.json | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/flatpak/org.gnome.Shotwell.json b/flatpak/org.gnome.Shotwell.json
index 34f3f952..11ce0b21 100644
--- a/flatpak/org.gnome.Shotwell.json
+++ b/flatpak/org.gnome.Shotwell.json
@@ -215,6 +215,20 @@
                 }
             ]
         },
+        {
+            "name" : "libchamplain",
+            "config-opts" : [
+                "--enable-vala"
+            ],
+            "sources" : [
+                {
+                    "type" : "git",
+                    "tag" : "LIBCHAMPLAIN_0_12_18",
+                    "commit" : "3abc28430124256660a7321da1fa6571f2975ad7",
+                    "url" : "https://gitlab.gnome.org/GNOME/libchamplain.git";
+                }
+            ]
+        },
         {
             "name" : "shotwell",
             "buildsystem" : "meson",