Merge pull request #398 from vy/patch-3

Enhance the logging pattern.

logback.xml

 <configuration scan="true">
   <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
     <encoder>
-      <pattern>%level [%logger:%thread] %msg%n</pattern>
+      <pattern>%date{yyyy-MM-dd HH:mm:ss.S} %-5level [%logger{15}] %msg%n</pattern>
     </encoder>
   </appender>
   <root level="INFO">