Pyspelling

- **FIX**: Add note in `--help` option about `--source` behavior.
- **FIX**: Better documentation on language options and Unicode normalization in international languages.

- **FIX**: Allow camel case options in Aspell.

- **NEW**: Check for `.pyspelling.yml` or `.pyspelling.yaml` by default.
- **FIX**: Fix documentation about how to specify languages in Aspell and how to specify languages when compiling custom wordlists. In short, `d` should be used for specifying languages in general, but when using custom wordlists, `lang` should be specified, and it should reference the `.dat` file name..
- **FIX**: Fix spelling in help output.
- **FIX**: Raise error in cases where pipeline options are not indented enough and parsed as an additional pipeline name.
- **FIX**: Drop Python 3.5 support and officially support Python 3.9.

- **FIX**: Upgrade to `wcmatch` 6.0.3 which fixes issues dealing with dot files and globstar (`**`) when dot globbing is not enabled. Also fixes a small logic error with symlink following and globstar. 6.0.3 is now the minimum requirement.

- **NEW**: Add support for `wcmatch` version `6.0`.
- **NEW**: `wcmatch` version `6.0` adds a default pattern limit of `1000` to help protect against really large pattern expansions such as `{1..1000000}`. If you wish to control this default, or disable it entirely, you can via the new `glob_pattern_limit` configuration option.