Update python-future to rev 11 via SR 754444
    
    https://build.opensuse.org/request/show/754444
    by user dimstar_suse
    - Update to 0.18.2:
      - Fix min/max functions with generators, and 'None' default (PR #514)
      - Use BaseException in raise_() (PR #515)
      - Fix builtins.round() for Decimals (Issue #501)
      - Fix raise_from() to prevent failures with immutable classes (PR #518)
      - Make FixInput idempotent (Issue #427)
      - Fix type in newround (PR #521)
      - Support mimetype guessing in urllib2 for Py3.8+ (Issue #508)
      - fix for raise_() when passed an exception that's not an
        Exception (e.g. BaseException subclasses)
    - Rebase future-correct-mimetype.patch to revert incorrect fix in
      gh#PythonCharmers/python-future#508