Update mailchecker requirement from ~=5.0.0 to ~=5.0.1 (#112)

Updates the requirements on [mailchecker](https://github.com/FGRibreau/mailchecker) to permit the latest version.
- [Release notes](https://github.com/FGRibreau/mailchecker/releases)
- [Changelog](https://github.com/FGRibreau/mailchecker/blob/master/CHANGELOG.md)
- [Commits](FGRibreau/mailchecker@v5.0.0...v5.0.1)

---
updated-dependencies:
- dependency-name: mailchecker
  dependency-type: direct:production
...

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requirements.txt

@@ -1,5 +1,5 @@
 ftfy ~= 6.0.0
-mailchecker ~= 5.0.0
+mailchecker ~= 5.0.1
 phonenumbers ~= 8.12.55
 python-dateutil ~= 2.8.2
 python-fsutil ~= 0.6.1