Revert change to logback to continue supporting JDK 8.

Author: rjeberhard

pom.xml

@@ -233,7 +233,7 @@
       <dependency>
         <groupId>ch.qos.logback</groupId>
         <artifactId>logback-classic</artifactId>
-        <version>1.4.11</version>
+        <version>1.3.11</version>
         <scope>test</scope>
       </dependency>
       <dependency>