Sync version number with the current CVS version.
Sync version number with the current CVS version.

(Note that the docs are also being maintained on the 2.1.1 maintenance
 branch, so users interested only in corrections and clarifications
 can get that.)

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