Support SODA API version 2.1

[bolek]

I am trying to run the following query:

def soql = new SoqlQueryBuilder()
        .addSelectPhrase("count(*)")
        .setWhereClause(":updated_at>'${dateString}'")
        .build();

soda-java currently generates the following url:

https://data.cityofnewyork.us/resource/fhrw-4uyv.json?$select=count(*)&$where=:updated_at%3E%272018-05-08T21:19:25Z%27&$$version=2.0

which returns

{"message":"Invalid SoQL query","errorCode":"query.soql.invalid","data":{}}

Seems that this particular query is not supported by API version 2.0. Changing version to 2.1 results in a successful response.

The API SODA_VERSION is set here: https://github.com/socrata/soda-java/blob/75f89c952816376c3df5b7795ef53705fc19c7bb/src/main/java/com/socrata/api/HttpLowLevel.java#L633

Are there any plans to bump SODA_VERSION to 2.1?