JSON encode orderBy, equalTo, startsAt, endsAt

[mrozbarry]

Although the documentation is not clear, these values need to have .to_json (or equivalent) applied to their values, otherwise you get an API error while querying a collection.

[mrozbarry]

For more details, check out CodementorIO/rest-firebase#2

[luizcarvalho]

Although the documentation is not clear, these values need to have .to_json (or equivalent) applied to their values, otherwise you get an API error while querying a collection.

Thank you bro!