Truncate URL which should be maximum 255 lenght.
Reason: Today I got this error:
```
Next exception 'Illuminate\Database\QueryException' with message 'SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'url' at row 1 (SQL: insert into `system_request_logs` (`url`, `status_code`, `count`, `updated_at`, `created_at`) values (http://www.mysite.com/docs/%C3%83%C6%92%...<too-many-chars>...%80%9A%C3%82%C2%814.pdf, 404, 1, 2016-01-02 12:16:08, 2016-01-02 12:16:08))
```
