Versiongit

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Fixed:

- `Make setup.py snippet mypy compatible <../../pull/10>`_

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Changed:

- `Drop Python2 support <../../pull/9>`_

Fixed:

- `Only import _version_git.py from immediate subdirectories <../../pull/7>`_

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- Only match tags of format [0-9]*[-.][0-9]* (E.g. 1.2.3b3)
- Untagged version now starts with 0.0+ rather than 0+

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- Remove -C argument from git command to support git 1.8 onwards
- Print the git error to stderr if the git command fails

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- Change commandline tool to be called ``versiongit`` rather than
``version-git``
- Tweak version numbers to match versioneer

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- Put the static version and sha1 in GIT_REFS and GIT_SHA1 rather than writing
_version_static.py