Pip-compile-multi

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* Fix cross-feature logic for --autoresolve and --upgrade-package
(PR `236`_).

.. _236: https://github.com/peterdemin/pip-compile-multi/pull/236

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* Fix for a bug introduced in 2.2.2 when running pip-compile-multi
installed for Python 3, and having ``python`` symlinked to Python 2
(Issue `233`_, PR `234`_).

.. _233: https://github.com/peterdemin/pip-compile-multi/issues/233
.. _234: https://github.com/peterdemin/pip-compile-multi/pull/234

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* Make SHA1 hashes of input files in a more robust way (Issue `215`_).
Now it ignores changes to comments, whitespace and order of packages.

.. _215: https://github.com/peterdemin/pip-compile-multi/issues/215

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* Add support for calling using `python -m pipcompilemulti.cli_v1` notation.

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* Add ``--skip-constraints`` option.
* Fix bootstrapping for autoresolve case with missing output files.

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* Add ``--autoresolve`` option for conflict-free compilations (PR 224).
* Auto-discover requirements in other directories by following references (PR 221).
* Add support for new-style multiline "via" comments from pip-tools (PR 222).