Parse linebreaks as a backslash before a newline

src/MdToHTML.hs

@@ -58,7 +58,7 @@ instance Show MdToken where
   show (Header level token) = "<h" ++ show level ++ ">" ++ show token ++ "</h" ++ show level ++ ">"
   show (Para token) = "<p>" ++ show token ++ "</p>"
   show (Line tokens) = concatMap show tokens
-  show Linebreak = "<br>"
+  show Linebreak = "<br />\n"
   show SingleNewline = " "
   show HorizontalRule = "<hr>"
   show (Blockquote tokens) = "<blockquote>" ++ concatMap show tokens ++ "</blockquote>"
@@ -224,11 +224,17 @@ parseLink = do
 
 -- Parse a linebreak character
 parseLinebreak :: Parser MdToken
-parseLinebreak = do
+parseLinebreak = parseLinebreakSpace <|> parseLinebreakBackslash
+  where
+    parseLinebreakSpace = do
       char ' '
       some (char ' ')
       char '\n'
       return Linebreak
+    parseLinebreakBackslash = try $ do
+      char '\\'
+      char '\n'
+      return Linebreak
 
 parseTableRow :: Parser [MdToken]
 parseTableRow = do