docs: Fix markdown syntax

Author: benja2998

README.md

@@ -79,6 +79,7 @@ call label_name
 # As of 1.1.0, you can include libraries in Batch++.
 _include <lib.bpp> # Library in PATH
 _include "lib.bpp" # Library not in PATH
+```
 
 Anything not mentioned to be part of the language syntax that is part of Batch syntax is supported.