Fix the code for SQLAlchemy 1.4
Since SQLAlchemy 1.4, queries doe s not work.
Pre-cached queries fails on:
...
File "/var/www/uwsgi_sview/sview/data_helpers.py", line 31, in query_to_json
result = process_query(query, params, post_process)
File "/var/www/uwsgi_sview/sview/data_helpers.py", line 18, in process_query
result.append(dict(row.items()))
AttributeError: Could not locate column in row for column 'items'
The problematic line is v0.3.1:sview/data_helpers.py#L18