Influxdb-client

Features
1. [92](https://github.com/influxdata/influxdb-client-python/issues/92): Optimize serializing Pandas DataFrame for writing

API
1. [110](https://github.com/influxdata/influxdb-client-python/pull/110): Removed log system from Bucket, Dashboard, Organization, Task and Users API - [influxdb#18459](https://github.com/influxdata/influxdb/pull/18459), Update swagger to latest version

Bug Fixes
1. [105](https://github.com/influxdata/influxdb-client-python/pull/105): Fixed mapping dictionary without timestamp and tags into LineProtocol
1. [108](https://github.com/influxdata/influxdb-client-python/pull/108): The WriteApi uses precision from Point instead a default precision

Features
1. [79](https://github.com/influxdata/influxdb-client-python/issues/79): Added support for writing Pandas DataFrame

Bug Fixes
1. [85](https://github.com/influxdata/influxdb-client-python/issues/85): Fixed a possibility to generate empty write batch
2. [86](https://github.com/influxdata/influxdb-client-python/issues/86): BREAKING CHANGE: Fixed parameters in delete api - now delete api accepts also bucket name and org name instead of only ids
1. [93](https://github.com/influxdata/influxdb-client-python/pull/93): Remove trailing slash from connection URL

Documentation
1. [75](https://github.com/influxdata/influxdb-client-python/issues/75): Updated docs to clarify how to use an org parameter

Features
1. [59](https://github.com/influxdata/influxdb-client-python/issues/59): Set User-Agent to influxdb-client-python/VERSION for all requests

Bug Fixes
1. [61](https://github.com/influxdata/influxdb-client-python/issues/61): Correctly parse CSV where multiple results include multiple tables
1. [66](https://github.com/influxdata/influxdb-client-python/issues/66): Correctly close connection pool manager at exit
1. [69](https://github.com/influxdata/influxdb-client-python/issues/69): `InfluxDBClient` and `WriteApi` could serialized by [pickle](https://docs.python.org/3/library/pickle.html#object.__getstate__) (python3.7 or higher)

Features
1. [52](https://github.com/influxdata/influxdb-client-python/issues/52): Initialize client library from config file and environmental properties

CI
1. [54](https://github.com/influxdata/influxdb-client-python/pull/54): Add Python 3.7 and 3.8 to CI builds

Bug Fixes
1. [56](https://github.com/influxdata/influxdb-client-python/pull/56): Fix default tags for write batching, added new test
1. [58](https://github.com/influxdata/influxdb-client-python/pull/58): Source distribution also contains: requirements.txt, extra-requirements.txt and test-requirements.txt

Features
1. [50](https://github.com/influxdata/influxdb-client-python/issues/50): Implemented default tags

API
1. [47](https://github.com/influxdata/influxdb-client-python/pull/47): Updated swagger to latest version

CI
1. [49](https://github.com/influxdata/influxdb-client-python/pull/49): Added beta release to continuous integration

Bug Fixes
1. [48](https://github.com/influxdata/influxdb-client-python/pull/48): InfluxDBClient default org is used by WriteAPI