* Add `MODULE` const value to `PyTypeInfo` trait
* Allow setting module name in `pyclass` macro arguments
* Add `$module` argument to `pyobject_native_type` macro in `pyo3::types`
* Set the right module for builtin types in `pyo3::types`
* Add `module` argument to example `word_count.WordCounter` class
* Add `module` argument of `pyclass` macro to guide
* Reformat code using `rustfmt`
* Add tests and entry in CHANGELOG.md for `module` argument in `pyclass`
* Make `$module` parameter in `pyobject_native_type` optional
* Make `pyobject_native_type` declare module as `Some("builtins")` by default
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