Documentation doesn't mention how to log exceptions

[krzyk]

I can't find in documentation (README.md, javadocs or log.jcabi.com) how to log exceptions (exception name + message + stacktrace).
Please add example into README.md and javadoc of Logger on how to log exceptions.

[dmarkov]

@yegor256 take a look at this issue please and dispatch it somehow, see par.21

[yegor256]

@krzyk this page explains it: http://log.jcabi.com/decors.html

Logger.info(this, "failure: %[exception]s", ex);