Adblock

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Fixes
* Remove relative import which caused problems in [17](https://github.com/ArniDagur/python-adblock/issues/17).

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New
* Windows 32-bit prebuilt wheels.

Changes
* Updated PyO3 to version `0.13`.
* Changed `__repr__` methods of classes to be more idiomatic.

Breaks
* Dropped Python `3.5` support.

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New
* Maintain a `CHANGELOG.md` file.
* Include `generichide` field in `UrlSpecificResources`.

Fixes
* Include `Cargo.lock` in source control, fixing incorrect dependency resolution [15](https://github.com/ArniDagur/python-adblock/issues/15).

Breaks
* Remove `explicit_cancel` field from `BlockerResult`, as it has been removed upstream.

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New
* Build Python 3.9 wheels.

Changes
* Updated PyO3 to version `0.12`.

Fixes
* Don't use star imports in `__init__.py` to give linters and type checkers more information.