Log Message:
Version 3.11.1:
* Fix issue with item_sort_key when speedups are available, and add
  auto-discovery to test suites to prevent similar regressions

Version 3.11.0:
* docstring fix in JSONEncoder
* Call PyObject_IsTrue() only once for the strict argument of scanner
* Fix a crash with unencodable encoding in the encoder
* Remove unused imports
* Remove remnants of Python 2.4 support
* Fix argument checking errors in _speedups.c
* Remove the `__init__` methods in extension classes
* Fix typo in the doc for loads
* Add Python 3.6 to testing matrix and PyPI metadata