Aioinflux

Changed
- [BREAKING] Removed `DataPoint` functionality in favor of simpler and more
flexible `lineprotocol` decorator. See the
[docs](https://aioinflux.readthedocs.io/en/latest/usage.htmlwriting-user-defined-class-objects) for details.

Docs
- Added detailed `lineprotocol` usage

Fixed
- Fixed bug when doing multi-statement queries when using `dataframe` mode

Docs
- Added note regarding handling of multi-statement/multi-series queries when using `dataframe` mode

Added
- Added ability to write `datapoint` objects. See the
[docs](https://aioinflux.readthedocs.io/en/latest/usage.htmlwriting-datapoint-objects) for details.
- Added `bytes` output format. This is to facilitate the addition of a caching layer on top of InfluxDB. (cb4e3d1)

Changed
- Change `write` method signature to match the `/write` endpoint docs
- Allow writing to non-default retention policy (14)
- (`precision` is not fully implemented yet)
- Renamed `raw` output format to `json`. Most users should be unaffected by this. (cb4e3d1)

Fixed
- Improved docs

Internal
- Refactored serialization/parsing functionality into a subpackage
- Fix test warnings (2e42d50)

- Fixed `output='dataframe'` parsing bug (15)
- Removed tag column -> categorical dtype conversion functionality
- Moved documentation to Read The Docs
- Added two query patterns (671013b)
- Added this CHANGELOG

- Python 3.7 support
- Sphinx-based documentation hosted at Read the Docs
- Minor dataframe serialization debugging (364190fa)

- Fix parsing bug for string ending in a backslash (db8846e)
- Add InfluxDBWriteError exception class (d8d0a01)
- Make InfluxDBClient.db attribute optional (039e088)