Log suppressed exceptions in MillisecondPrecisionSyslogAppender #25
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This adds support for logging suppressed exceptions. Without this change they are silently ignored contrary to a regular throwable.printStackTrace() which does print them.
Inspiration has been taken from the upstream implementation in another appender: https://github.com/qos-ch/logback/blob/master/logback-classic/src/main/java/ch/qos/logback/classic/pattern/RootCauseFirstThrowableProxyConverter.java#L33