Update release process

Should be no visible changes

`verify_all_combinations_async()`

Allows you to pass in functions that are async.

Fix Sublime Merge and Tortoise Git Diff Reporters

These reporters require special arguments, and special arguments are now supported.

More Diff Tols

Added more diff tools from https://github.com/approvals/DiffTools

breaking: change to diff reporters

This release introduces more diff tool reporters, but breaks the names of existing reporters and how you retrieve them.

We are letting go of the reporters defined in reporters.json, although that file is still supported for your customization.

Most reporters can be found with a name starting with ReportWith... e.g. options=Options().with_reporters(ReportWithBeyondCompare). For more information see Why we changed reporters.

Better error message and fixed repr recursion error

Fixes #224 and #223

Performance upgrade

closes #167

v16.2.1

No user-visible changes.

ReportByOpeningFiles

Added a new reporter that launches files based on your OS preferences

NOTE: we also changed the version variable to remove the v. This is in the version.py file
old -> "v16.2.0"
new -> "16.2.0"

escape control characters in inline approvals

Special characters (e.g. null, backspace, right-to-left marker) in the expected value will now be escaped for inline approvals.

Before:

    """
    hello! world
    """

After:

    """
    hello!\u200fworld
    """