Influxdb-client

Others
1. [472](https://github.com/influxdata/influxdb-client-python/pull/472): Drop supports for Python 3.6
1. [495](https://github.com/influxdata/influxdb-client-python/pull/495): Add warning for measurement name starts with `#`

Documentation
1. [397](https://github.com/influxdata/influxdb-client-python/pull/397): Add an example: How to use RxPY to prepare batches by maximum bytes count
1. [269](https://github.com/influxdata/influxdb-client-python/pull/269): Add new example: How to check connection credentials

Bug Fixes
1. [183](https://github.com/influxdata/influxdb-client-python/pull/183): Fixes to DataFrame writing.
1. [181](https://github.com/influxdata/influxdb-client-python/pull/181): Encode Point whole numbers without trailing `.0`

Documentation
1. [189](https://github.com/influxdata/influxdb-client-python/pull/189): Updated docs about `DeleteApi`.

Bug Fixes
1. [655](https://github.com/influxdata/influxdb-client-python/pull/655): Replace deprecated `urllib` calls `HTTPResponse.getheaders()` and `HTTPResponse.getheader()`.

Others
1. [654](https://github.com/influxdata/influxdb-client-python/pull/654): Enable packaging type information - `py.typed`

Bug Fixes
1. [648](https://github.com/influxdata/influxdb-client-python/pull/648): Fix `DataFrame` serialization with `NaN` values