Remove outdated information.  Merge now dead BeOS/README-readline.  I'm not sure if that information is still relevant though.
Remove outdated information.  Merge now dead BeOS/README-readline.  I'm not
sure if that information is still relevant though.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator