[gnome-maps] sidebar: Add GraphHopper credits

[Jonas Danielsson <jonasdn src gnome org>]

commit 3d0396fd1ed0d5d8211306eaeccbcd9a3c6752a6
Author: Jonas Danielsson <jonas threetimestwo org>
Date:   Sun Feb 15 14:59:35 2015 +0100

    sidebar: Add GraphHopper credits

 data/ui/sidebar.ui |   11 +++++++++++
 1 files changed, 11 insertions(+), 0 deletions(-)
---
diff --git a/data/ui/sidebar.ui b/data/ui/sidebar.ui
index 15fc36b..6da7205 100644
--- a/data/ui/sidebar.ui
+++ b/data/ui/sidebar.ui
@@ -168,6 +168,17 @@
         </child>
       </object>
     </child>
+    <child>
+      <object class="GtkLinkButton" id="linkbutton1">
+        <property name="label" translatable="yes">Route search by GraphHopper</property>
+        <property name="visible">True</property>
+        <property name="can_focus">True</property>
+        <property name="receives_default">True</property>
+        <property name="use_action_appearance">False</property>
+        <property name="relief">none</property>
+        <property name="uri">https://graphhopper.com</property>
+      </object>
+    </child>
   </object>
 
   <object class="GtkBox" id="instruction-box">