Multidict

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* Fix type annotations

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* Remove memory leak in :py:func:`istr <multidict.istr>` implementation
:issue:`105`

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* Raise :py:exc:`RuntimeError` on :py:class:`dict` iterations if the dict was changed (:issue:`99`)

* Update ``__init__.pyi`` signatures

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* Refactor internal data structures: main dict operations are about
100% faster now.

* Preserve order on multidict updates

Updates are ``md[key] = val`` and ``md.update(...)`` calls.

Now **the last** entry is replaced with new key/value pair, all
previous occurrences are removed.

If key is not present in dictionary the pair is added to the end

:issue:`68`

* Force keys to :py:class:`str` instances
:issue:`88`

* Implement :py:func:`.popall(key[, default]) <multidict.MultiDict.popall>`
:issue:`84`

* :py:func:`.pop() <multidict.MultiDict.pop>` removes only first occurrence,
:py:func:`.popone() <multidict.MultiDict.popone>` added
:issue:`92`

* Implement dict's version
:issue:`86`

* Proxies are not pickable anymore
:issue:`77`

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* Fix import warning on Python 3.6
:issue:`79`

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* Rebuild the library for fixing missing ``__spec__`` attribute
:issue:`79`