Update `keysBlacklist` option to `keysBlocklist`

[thompiler]

Howdy!

We recently updated the phpbrake library to use updated terminology for the filtering option. keysBlacklist is still supported but is deprecated in favor of keysBlocklist. Users that set keysBlacklist will see a message like this in their log though it will still work at filtering params:

phpbrake: keysBlacklist is a deprecated option. Use keysBlocklist instead.

I've done some testing myself (full disclosure: Laravel novice) with this library in an example Laravel app and I think simply updating these two mentions to keysBlocklist would do the trick:

https://github.com/TheoKouzelis/laravel-airbrake/blob/e6adcae6c9577224a59f8a635602b4de12e04143/config/airbrake.php#L15

https://github.com/TheoKouzelis/laravel-airbrake/blob/da1e9470efd43ccdb82c025143d7ffd9662bfd28/README.md#L40

I'd be happy to submit a PR for that if you think that would be helpful.