Tartufo

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Bug fixes:

* [339](https://github.com/godaddy/tartufo/issues/339) - Fix `click` compatibility issues. Specifically:
* Pin to < 8.1.0 for Python 3.6, as support for that version was dropped
* Pin to >= 8.1.0 for Python 3.7+, and change `resultcallback` usage to `result_callback`
* Upgraded to the latest version of `black`

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Bug fixes:

* [336](https://github.com/godaddy/tartufo/issues/336) - `_issue_file` was not defined by default, causing all scans to fail

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Features:

* [328](https://github.com/godaddy/tartufo/pull/328) - Buffer issues beyond --buffer-size to a temporary file

Bug fixes:

* [330](https://github.com/godaddy/tartufo/pull/330) - Allow newer versions of pygit2 for newer versions of Python

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Version 3.0.0. Stable Release.

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Bug fixes:

* [301](https://github.com/godaddy/tartufo/issues/301) - Parse new-style option
values correctly, avoid duplicate processing of global options, and don't
generate spurious deprecation warnings for these options.
* [303](https://github.com/godaddy/tartufo/pull/303) - Include or exclude git submodules
only if we're not working with a mirror clone.

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Bug fixes:

* [296](https://github.com/godaddy/tartufo/pull/296), [#297](https://github.com/godaddy/tartufo/pull/297) -
Fix our Docker image so that it actually builds, and the tartufo command works
* [298](https://github.com/godaddy/tartufo/pull/298) - Fix how we determine whether
we are scanning a shallow clone, so that it is more bulletproof.