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. [672](https://github.com/influxdata/influxdb-client-python/pull/672): Adding type validation to url attribute in client object
2. [674](https://github.com/influxdata/influxdb-client-python/pull/674): Add type linting to client.flux_table.FluxTable, remove duplicated `from pathlib import Path` at setup.py
3. [675](https://github.com/influxdata/influxdb-client-python/pull/675): Ensures WritePrecision in Point is preferred to `DEFAULT_PRECISION`

Bug Fixes
1. [667](https://github.com/influxdata/influxdb-client-python/pull/667): Missing `py.typed` in distribution package

Examples:
1. [664](https://github.com/influxdata/influxdb-client-python/pull/664/): Multiprocessing example uses new source of data
1. [665](https://github.com/influxdata/influxdb-client-python/pull/665): Shows how to leverage header fields in errors returned on write.