Github-backup

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Fix
~~~
- Do not update readme. [Jose Diaz-Gonzalez]
- Adjust for black. [Jose Diaz-Gonzalez]
- Adjust for black. [Jose Diaz-Gonzalez]
- Adjust for black. [Jose Diaz-Gonzalez]

Other
~~~~~
- Feat: commit gitchangelog.rc to repo so anyone can generate a
changelog. [Jose Diaz-Gonzalez]
- Feat: add release tagging. [Jose Diaz-Gonzalez]
- Chore: formatting. [Jose Diaz-Gonzalez]
- Chore: run black. [Jose Diaz-Gonzalez]
- Add --log-level command line argument. [Enrico Tröger]

Support changing the log level to the desired value easily.
For example, this is useful to suppress progress messages but
keep logging warnings and errors.
- Check both updated_at and pushed_at properties. [Ken Bailey]

Check both updated_at and pushed_at dates to get the last_update to reduce data retrieved on incremental api calls using since.

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- Add option to exclude repositories. [npounder]
- Backup regular pull request comments as well. [Oneric]

Before, only review comments were backed up;
regular comments need to be fetched via issue API.
- Fix bug forever retry when request url error. [kornpisey]
- Added --no-prune option to disable prune option when doing git fetch.
[kornpisey]

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- Git lfs clone doe snot respect --mirror. [Louis Parisot]

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- Fix lint issues raised by Flake8. [atinary-afoulon]

According to job:
[ https://app.circleci.com/pipelines/github/josegonzalez/python-github-backup/30/workflows/74eb93f2-2505-435d-b728-03b3cc04c14a/jobs/23 ]

Failed on the following checks:
./github_backup/github_backup.py:20:1: F811 redefinition of unused 'logging' from line 14
./github_backup/github_backup.py:45:1: E302 expected 2 blank lines, found 1
./github_backup/github_backup.py:136:20: E251 unexpected spaces around keyword / parameter equals

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- Revert to fetch. [Harrison Wright]

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- Add retry on certain network errors. [Jacek Nykis]

This change includes certain network level errors in the retry logic.
It partially address 110 but I think more comprehensive fix would be useful.
- Pull changes from remote. [Jonas]

use `git pull` to pull actual files from the remote instead of using `fetch` for only the metadata