This is a strict decoding method that doesn't tolerate '=' padding.

Resolves #22.

PHP 7.0 doesn't support nullable types, so we can't type-hint this as ?int. If we declare it as int, users can't explicitly pass NULL.

Clean up unnecessary annotations

GitHub actions improvements and fixes

- Run actions on pull request
- Run actions with PHP 8.1 as well
- Fixes for Psalm failures
- Use Psalm provided by tools
- Run PHPUnit on correct PHP and PHPUnit versions

Add .gitattributes file to ignore paths when exporting

Switch from Travis CI to Github Actions

Show users the proper way of importing classes

We have to remove 7.0 since Travis uses Composer 2 and our dependencies will not install on PHP 7.0

Fix exception message

Declare RFC4648 functions static

Update Base32.php