added bat to gitignore

diff --git a/.gitignore b/.gitignore
index 584686e..b2657ab 100644
--- a/.gitignore
+++ b/.gitignore
@@ -18,6 +18,7 @@ $RECYCLE.BIN/
 *.msi
 *.msm
 *.msp
+*.bat

 # Windows shortcuts
 *.lnk