[four-in-a-row] Use a Unicode apostrophe in AppData

[Piotr Drąg <piotrdrag src gnome org>]

commit 046a1bb009be1d17dae4f3c1f2cb509ad1282ee0
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Wed Feb 6 20:27:54 2019 +0100

    Use a Unicode apostrophe in AppData
    
    See https://developer.gnome.org/hig/stable/typography.html

 data/org.gnome.Four-in-a-row.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/org.gnome.Four-in-a-row.appdata.xml.in b/data/org.gnome.Four-in-a-row.appdata.xml.in
index 314a441..721b1bb 100644
--- a/data/org.gnome.Four-in-a-row.appdata.xml.in
+++ b/data/org.gnome.Four-in-a-row.appdata.xml.in
@@ -14,7 +14,7 @@
       diagonal. The first player to connect four in a row is the winner!
     </p>
     <p>
-      Four-in-a-row features multiple difficulty levels. If you're having trouble,
+      Four-in-a-row features multiple difficulty levels. If you’re having trouble,
       you can always ask for a hint.
     </p>
   </description>