Import module for word wrapping; add package to cabal file

md-to-html.cabal

@@ -62,7 +62,8 @@ library
                       megaparsec,
                       parser-combinators,
                       text,
-                      MissingH
+                      MissingH,
+                      word-wrap
 
 executable md-to-html-runner
     -- Import common warning flags.

src/MdToHTML.hs

@@ -17,6 +17,7 @@ import Debug.Trace
 import Text.Megaparsec
 import Text.Megaparsec.Char
 import Text.Printf
+import Text.Wrap
 
 type Parser = Parsec Void T.Text