py-rope: updated to 0.17.0

New release 0.17.0:
Make tests compatible with Python 3.8
Use context manager for open()
Don窶冲 use UserDict (!!!) and collections.MutableMapping.
assertEquals has been deprecated for long time (-> assertEqual)
Remove weird escpaing of 's' character, which is the syntax error these days.
Add testing for Python 3.8 as well
Fix pattern for matching short strings
Work with deprecated types and using aliased ones.
Don't use underscored _ast, but use ast instead
Direct import from collections is getting deprecated.
Use .is_alive method instead of a deprecated .isAlive in threading.Thread
Fix simple typo: sitaution -> situation
Two more assertEquals happened.

(adam)