Support for winston default collection, more tests
logs: timestamp -> _timestamp, better organization
Readme: add logs reference, remove newline
Update dev dependency: thehelp-test
v2.1.0

* If `winston` is installed, `logs.setupConsole()` and `logs.setupFile()` will now set up those transports both for the default logger (`winston.info()`) and for the default collection (`winston.loggers.get()`).