Fix offset notices and fatal error

The `$limit` should be set to 2. As this solution results in errors:

* Notice: Undefined offset: 1 in src/httpAdapters/SagCURLHTTPAdapter.php on line 96
* Fatal error: Cannot access empty property in src/httpAdapters/SagCURLHTTPAdapter.php on line 115

The docs for limit param say: If limit is set and positive, the returned array will contain a maximum of limit elements with the last element containing the rest of string.