Gitignore-parser

Thank you matthieumarrast for the [PR](https://github.com/mherrmann/gitignore_parser/pull/64)!

Thank you ericwb for the [PR](https://github.com/mherrmann/gitignore_parser/pull/63)!

Thank you ruancomelli for the [PR](https://github.com/mherrmann/gitignore_parser/pull/59).

Thank you jherland!

- Fix lack of implicit anchoring of patterns to directory separators (58)
- Fix multi-asterisks that fall outside of the special cases (57)
- Fix "a/**/b" matching "a/bb" (56)

Thank you jherland!

- [Fix patterns with leading exclamation marks](https://github.com/mherrmann/gitignore_parser/pull/54)
- [Fix pattern with slash in range](https://github.com/mherrmann/gitignore_parser/pull/55)

Great PRs by ruancomelli:

- https://github.com/mherrmann/gitignore_parser/pull/48
- https://github.com/mherrmann/gitignore_parser/pull/49
- https://github.com/mherrmann/gitignore_parser/pull/50
- https://github.com/mherrmann/gitignore_parser/pull/51

Also fixes a depreciation warning (42).

Thank you ruancomelli!