v0.6.0

Important: RingLogger.tail is now RingLogger.next. RingLogger.tail shows
the last n lines of the log (default is 10).

• New features
  • grep greps the whole log entry rather than just the message portion. You
    can grep on timestamps and message levels now.
  • Functions that print log messages do the printing in the caller's context so
    that printing timeouts don't happen in RingLogger GenServers calls.
  • Added :none as a per-module log level to completely silence a module.
  • Added :pager option to specify a custom printer for the interactive
    commands.