Add cleaners (@-mention cleaner)

[dwhswenson]

Resolves #42.

[codecov[bot]]

Codecov Report

Patch coverage: 76.19% and project coverage change: +1.49% :tada:

Comparison is base (582cb32) 21.69% compared to head (e41dafd) 23.19%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #47 +/- ## ========================================== + Coverage 21.69% 23.19% +1.49% ========================================== Files 16 18 +2 Lines 742 763 +21 ========================================== + Hits 161 177 +16 - Misses 581 586 +5 ``` | [Files Changed](https://app.codecov.io/gh/dwhswenson/ticgithub/pull/47?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=David+W.H.+Swenson) | Coverage Δ | | |---|---|---| | [ticgithub/tasks/emails\_to\_issues.py](https://app.codecov.io/gh/dwhswenson/ticgithub/pull/47?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=David+W.H.+Swenson#diff-dGljZ2l0aHViL3Rhc2tzL2VtYWlsc190b19pc3N1ZXMucHk=) | `0.00% <0.00%> (ø)` | | | [ticgithub/emailcleaners.py](https://app.codecov.io/gh/dwhswenson/ticgithub/pull/47?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=David+W.H.+Swenson#diff-dGljZ2l0aHViL2VtYWlsY2xlYW5lcnMucHk=) | `78.57% <78.57%> (ø)` | | | [ticgithub/tests/test\_emailcleaners.py](https://app.codecov.io/gh/dwhswenson/ticgithub/pull/47?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=David+W.H.+Swenson#diff-dGljZ2l0aHViL3Rlc3RzL3Rlc3RfZW1haWxjbGVhbmVycy5weQ==) | `100.00% <100.00%> (ø)` | |

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