[four-in-a-row] AI should move faster now.

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 08f6dded18275f01a3225502936f202eeff8230d
Author: Nikhar Agrawal <nikharagrawal2006 gmail com>
Date:   Wed Jun 18 22:16:40 2014 +0530

    AI should move faster now.
    
    Reduced the number of plies to 7 from 8.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=152722

 src/ai.vala |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/ai.vala b/src/ai.vala
index 247f474..a02337b 100644
--- a/src/ai.vala
+++ b/src/ai.vala
@@ -503,12 +503,12 @@ public class DecisionTree
                else if (vstr[0] == 'b')
                {
                        level = Difficulty.MEDIUM;
-                       plies = 8;
+                       plies = 7;
                }
                else
                {
                        level = Difficulty.HARD;
-                       plies = 8;
+                       plies = 7;
                }
        }