fix compiler that is concatenating string with an array on orderBy

[MPesic381]

This is a fix that is solving the issue #5

[adambanaszkiewicz]

Thanks for forking. Could You please provide me how repsoduce the bug? I cannot find out how this code fails.

[MPesic381]

Thanks for forking. Could You please provide me how repsoduce the bug? I cannot find out how this code fails.

Assuming that source is QB Factory, when I try this

$data = source()->from('users')->orderBy('username')->all();

it throws me and error.

Next Requtize\QueryBuilder\Exception\QueryExecutionFailException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '`username` ASC' at line 1 during query "SELECT * FROM `users` ORDER BY Array`username` ASC" in /home/unicode/vendor/requtize/query-builder/src/QueryBuilder/QueryBuilder/QueryBuilder.php:815
Stack trace:

Pay attention on the query that the package has build.