ghc-doclayout-0.3-bp153.1.20

- Update doclayout to version 0.3.
  [#]# 0.3
  * Add foldlChar to signature of HasChars [API change].
  * Use foldlChar in realLength. This avoids a stack overflow
    we were getting with long strings in the previous version
    (with foldrChar).  See jgm/pandoc#6031.
  * Replace isBlank with isBreakable and improved startsWithBlank.
    Previously isBlank was used in the layout algorithm where
    what we really wanted was isBreakable.
  * Avoid unnecessary calculation in updateColumns.
  * Replace a right fold with a strict left fold.
  * Add strictness annotations in realLength and updateColumn.

- Add doclayout at version 0.2.0.1.