[nsnake] Add missing dependency

[Christopher Meng]

commit da316d1819deb7a4b923796aec581e538b68649d
Author: Christopher Meng <i at cicku.me>
Date:   Thu Jul 10 15:13:28 2014 +0800

    Add missing dependency

 nsnake.spec |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/nsnake.spec b/nsnake.spec
index d643a1f..6a337a0 100644
--- a/nsnake.spec
+++ b/nsnake.spec
@@ -8,6 +8,7 @@ Source0:        https://github.com/alexdantas/nSnake/archive/v%{version}.tar.gz#
 Patch0:         https://github.com/cicku/nSnake/commit/df8e8e39d9de33be6ff725a53ab74a69129ce57c.patch
 License:        GPLv3+
 BuildRequires:  doxygen
+BuildRequires:  graphviz
 BuildRequires:  iniparser-devel
 BuildRequires:  ncurses-devel