Log Message:
py-rt: Update to 2.0.0

Changes:
2.0.0
-----
 - Drop Python2 support
 - Adjust Travis tests for Python3-only, and add v3.8
 - Add inline typing
 - Remove "debug_mode" parameter
 - Add "logging" support (basically replacing "debug_mode" \ 
and the various
   "print"s)
 - Fix "no-else-after-return" and "no-else-after-raise"
 - Fix "startswitch" typos / bugs
 - Removed deprecated "basic_auth" and "digest_auth" \ 
paramters. The same
   functionality is given by specifying the "http_auth" with an instance
   of either object. This allows for more flexibility with various other
   alternative authentication methods.

(Done in a separate commit of 1.0.13 update because 1.0.13 was the last release
supporting Python 2.7, if you use py-rt with python27 please let me know/feel
free to add a possible py-rt1 package.)