Logging doku ergänzen

<!-- Logging -->
<dependency>
	<groupId>ch.qos.logback</groupId>
	<artifactId>logback-classic</artifactId>
	<version>1.2.3</version>
</dependency>
<dependency>
	<groupId>ch.qos.logback</groupId>
	<artifactId>logback-core</artifactId>
	<version>1.2.3</version>
</dependency>

<configuration>
    <!-- https://stackoverflow.com/questions/3257154/how-to-prevent-logback-from-outputting-its-own-status-at-the-start-of-every-log -->
    <statusListener class="ch.qos.logback.core.status.NopStatusListener"/>

    <!-- Configure the Console appender -->
    <appender name="Console" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{"yyyy-MM-dd'T'HH:mm:ss,SSSXXX"} [%t] %-5level %logger{36} %X{sourceThread} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- Configure the Sentry appender, overriding the logging threshold to the WARN level -->
    <appender name="Sentry" class="io.sentry.logback.SentryAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARN</level>
        </filter>
        <!-- Optionally add an encoder -->
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- hide "Couldn't find a suitable DSN" warning -->
    <logger name="io.sentry" level="ERROR">
    </logger>

    <logger name="com.offbynull.portmapper" level="OFF">
    </logger>

    <!-- available levels: off, error, warn, info, debug, trace -->

    <root level="WARN">
        <appender-ref ref="Console"/>
        <appender-ref ref="Sentry"/>
    </root>
</configuration>