Update readme

Update readme with mailing list info

Merge branch 'hotfix/0.2.1'

Update changelog

Update cargo

Update abstract

Since v0.2.0 it's possible to log the messages.

Merge branch 'release/0.2.0'

Update changelog

Update version in cargo config

Merge branch 'feature/log-file'

Update changelog

Fix warnings

Add logging when env var supported

You need to specify LOG_DIR environment variable in order to log
messages to the directory.

The messages are stored on day basis to the file of the format
YYYY-MM-DD.

Update gitignore

Add how to think about wschat section to readme

Resolves: #1

Reformat readme

Merge branch 'hotfix/0.1.2'

Update cargo version

Update changelog

Set listening port to 80