Allow 2.0 on the list of target versions.  NB. this isn't enough: the GUI part, misc/install.c, still needs to be updated, and it looks like a non-trivial change.
Allow 2.0 on the list of target versions.  NB. this isn't enough: the GUI part,
misc/install.c, still needs to be updated, and it looks like a non-trivial
change.

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