Github-archive

- Adds new `languages` CLI flag allowing filtering via a comma-separated list of GitHub languages for repos (cannot be used with include/exclude) - (closes 59)
- Forking repos is now a threaded operation like all other operations instead of sequential

- Forking gists is now a threaded operation like all other operations instead of sequential
- Corrects two log messages that incorrectly mentioned `starred` resources when they should have been `org/user` resources

- Expand paths for user-supplied `--location` strings. This now allows for spaces in paths and proper expansion of home directories (eg: `~`)

- Fixes PyGithub pinned version to ensure `Auth` is available

- Allows the tool to be run without passing any authentication flags (previously, to use unauthenticated, you'd have to at least pass the `--https` flag)
- Removes constraint that required `--token` and `--https` to be mutually exclusive (you can now authenticate with other tools such as Git Credential Manager instead of only SSH)
- Adds `--version` CLI flag

- Drops support for Python 3.7
- Updates dependencies