Log Message:
Update to megaparsec-9.0.1

Megaparsec 9.0.1
* Added Safe Haskell support.

Megaparsec 9.0.0
* Split the Stream type class. The methods showTokens and tokensLength
  have been put into a separate type class VisualStream, while
  reachOffset and reachOffsetNoLine are now in TraversableStream. This
  should make defining Stream instances for custom streams easier.
* Defined Stream instances for lists and Seqs.
* Added the functions hspace and hspace1 to the Text.Megaparsec.Char
  and Text.Megaparsec.Byte modules.