Netius

Changed

* Moved flush operation up in the chain

Changed

* Flush of loggers before on logger unloading

Changed

* Optional `raise_e` support in `LogstashHandler`

Fixed

* Support for multiple messages for same SMTP session - [40](https://github.com/hivesolutions/netius/issues/40)

Added

* Support for `.env` file loading
* LogstashHandler support using `LOGGING_LOGSTASH` and `LOGSTASH_BASE_URL`

Changed

* Improved the structure of the Postmaster message

Fixed

* Context information `tos` in the Postmaster email handling
* Critical issue with the SMTP client when connecting with SMTP servers with older versions of OpenSSL