Added operand for json scopes

[rcerljenko]

Hi,

I've added ability to choose operand for where clause in json scopes. For example:

$query->whereJsonContainsLocale('title', 'en', 'hello%', 'like');

[freekmurze]

Could you document this in the readme and add a test to make sure it works?

[rcerljenko]

Could you document this in the readme and add a test to make sure it works?

Sure thing! Just added them...

[freekmurze]

Thanks!