fix: deck 2 horizontal separator

fix for windows
line ending difference caused failure
now simple.md content mirror deck1

test/simple.md

@@ -1,12 +1,10 @@
-## Slide 1.1
 
-```js
-var a = 1;
-```
+						## Slide 1.1
 
+						--
 
-## Slide 1.2
+						## Slide 1.2
 
+						---
 
-
-## Slide 2
+						## Slide 2