v0.14.0

Fixed

• base91: decode now silently ignores ASCII whitespace
  ( , \t, \n, \r, and the CR+LF cluster) instead of
  rejecting it as InvalidCharacter. The basE91 reference
  implementation is explicitly lenient about non-alphabet bytes,
  and the reference encoder wraps long output at 76 chars, so any
  caller piping wrapped text used to need a hand-rolled
  string.replace shim. (#60)
• ascii85: decode now skips ASCII whitespace at group
  boundaries and inside groups, mirroring the existing
  adobe_ascii85 posture (and the historical btoa reference
  decoders, which all ignore whitespace). Production btoa emitters
  routinely wrap output at column 76; rejecting whitespace forced
  every caller to strip it first. (#59)