gitignore: gitignore quilt's files

gitignore: ignore quilt's files.

Signed-off-by: Qi Yong <qiyong@fc-cn.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/.gitignore b/.gitignore
index 3f9bb5e..b1f5b9d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -34,3 +34,7 @@
 
 # stgit generated dirs
 patches-*
+
+# quilt's files
+patches
+series