4.1.0

Features

1. #286: Add support for Parameterized Queries

Bug Fixes

1. #283: Serialization null tag's value into LineProtocol
2. #285: Default dialect for Query APIs
3. #294: Mapping measurement with primitive float
4. #297: Transient dependency of okhttp, retrofit and rxjava
5. #292: Publishing runtime error as a WriteErrorEvent