Tartufo

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Bug fixes:

* Added rust toolchain to allow for building of latest cryptography

Other changes:

* Added no-fetch to code snippets and note about what it does

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Features:

* 42 - Report output on clean or successful scan. Add new `-q/--quiet` option to suppress output
* 43 - Report out of the list of exclusions. Add new `-v/--verbose` option to print exclusions
* 159 - Switched our primary development branch from `master` -> `main`
* Updated BFG refs from 1.13.0 to 1.13.2

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Bugfixes:

* Rev build and release versions to match

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Features:

* 119 - Added a new `--fetch`/`--no-fetch` option for local scans, controlling
whether the local clone is refreshed before scan. (Thanks jgowdy!)
* 125 - Implement CODEOWNERS and auto-assignment to maintainers on PRs

Bugfixes:

* 115 - Strange behavior can manifest with invalid sub-commands
* 117 - Ignore whitespace-only lines in exclusion files
* 118 - Local scans fetch remote origin
* 121 - Match rules specified with --git-rules-repo were not included in scans
* 140 - Ensure a valid output folder name in Windows

Other changes:

* 95 - Run CI across Linux, Windows, and MacOS
* 130 - Added references to Tartufo GoogleGroups mailing list to docs
* Fixed testing in Pypy3 and explicitly added Python 3.9 support
* 134 - Documented the release process
* 143 - Updated GitHub Action hashes to newest rev to address <https://github.blog/changelog/2020-10-01-github-actions-deprecating-set-env-and-add-path-commands/> where possible

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* Fix the Docker build & deploy

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* 74, 75 - Rewrote and refreshed the documentation for the new 2.0 usage (via
111)