Python-rpm-spec

Changes:

* Add type annotations for tools like mypy, your IDE, and your brain. Thanks [KOLANICH](https://github.com/KOLANICH).
* `replace_macros()` function now always expects a Spec instance as second argument. Does not make much sense without.
* Add support for parsing %description and %changelog (see PR [42](https://github.com/bkircher/python-rpm-spec/pull/42)). Thanks [BrunoVernay](https://github.com/BrunoVernay).
* Add support for ExcludeArch and ExclusiveArch ([45](https://github.com/bkircher/python-rpm-spec/pull/45)). Thanks [tonsh](https://github.com/tonsh).
* Add `warnings_enabled` knob to issue [warnings](https://docs.python.org/3/library/warnings.html#module-warnings) of type `UserWarning` during spec file parsing.

Changes:

* Ignore spaces before ':' separator (see PR [32](https://github.com/bkircher/python-rpm-spec/pull/32))
* Fix behavior of replace_macro function when macro is a tag, too (see issue [33](https://github.com/bkircher/python-rpm-spec/issues/33)).

Changes:

* Ignore case when parsing directives

New Features:

* Enable parsing versions in `BuildRequires:` and `Requires:`
* Add support for conditional macros, e.g. `%{?test_macro:expression}`
* Use flit for packaging

New Features:

* Add `Spec.sources_dict` and `Spec.patches_dict`