Add 'caseSensitive' option

[KevinSnyderCodes]

If 'caseSensitive' is true, strip_html() will not convert input to lowercase, allowing for case-sensitive queries.

[nitriques]

Thanks!

• [ ] Please add a commit for the correction (see comment)
• [ ] Document the option to the readme
• [ ] If you could also add a test (example) that would be neat!

[nitriques]

Also, please submit on https://github.com/DeuxHuitHuit/quicksearch, this repo is not maintained!

[KevinSnyderCodes]

Will do. Thanks for the tips!

[nitriques]

Thanks for contributing!