Tomli-w

- Removed
- Support for Python 3.7 and 3.8
- Added
- Accept generic `collections.abc.Mapping`, not just `dict`, as input.
Thank you [Watal M. Iwasaki](https://github.com/heavywatal) for the
[PR](https://github.com/hukkin/tomli-w/pull/46).
- `indent` keyword argument for customizing indent width of arrays.
Thank you [Wim Jeantine-Glenn](https://github.com/wimglenn) for the
[PR](https://github.com/hukkin/tomli-w/pull/49).
- Type annotations
- Type annotate `dump` function's output stream object as `typing.IO[bytes]` (previously `typing.BinaryIO`)

- Removed
- Support for Python 3.6
- Positional arguments of `dump` and `dumps` can no longer be passed by keyword.
- Changed
- Revised logic for when the "Array of Tables" syntax will be used.
AoT syntax is used when at least one of the tables needs multiple lines, or a single line wider than 100 chars, when rendered inline.
A nested structure no longer alone triggers the AoT syntax.

- Added
- Support for formatting Python `tuple`s as TOML arrays.
- Fixed
- Formatting of `decimal.Decimal("inf")`, `decimal.Decimal("-inf")` and `decimal.Decimal("nan")`.
- Changed
- A list of dicts is now rendered using the "Array of Tables" syntax
if at least one of the tables is a nested structure,
or at least one of the tables would need a line wider than 100 chars when rendered inline.
Thank you [Anderson Bravalheri](https://github.com/abravalheri) for the
[PR](https://github.com/hukkin/tomli-w/pull/15).

- Changed
- `dump` now supports binary file objects instead of text file objects

- Added
- `multiline_strings` keyword argument for enabling multi-line strings
- Changed
- Style: Do not make multi-line strings by default because they don't support lossless round-tripping

- Changed
- Style: Decide between multi-line and single line string solely based on if line breaks are present