fix multiline syntax

Author: php-coder

Dangerfile

@@ -62,7 +62,7 @@ else
 		to_line = node['endline']
 		line = "#L#{from_line}"
 		if to_line.to_i > from_line.to_i
-			line << '-' << to_line
+			line << '-L' << to_line
 		end
 		msg  = node.text.lstrip.sub(/\.$/, '')
 		file = node.parent['name'].sub(pwd, '')
@@ -154,7 +154,7 @@ else
 		to_line = src['end']
 		line = "#L#{from_line}"
 		if to_line.to_i > from_line.to_i
-			line << '-' << to_line
+			line << '-L' << to_line
 		end
 		msg  = node.xpath('./LongMessage').first.text
 		file = src['sourcepath']