Log Message:
Update devel/py-lupa to version 1.7.

Official release notes:

    GH#103: Provide wheels for MS Windows and fix MSVC build on Py2.7.

Some notable commits:

- Fix a potential crash on Python shutdown when trying to create a traceback
  entry for an exception, by statically disabling C-lines in tracebacks.
-  Remove official support for Py2.6 and add it for Py3.7.