Merge pull request #29 from spotify/dnsjava-2.1.8

pom: Upgrade to dnsjava 2.1.8

Author: pettermahlen

pom.xml

@@ -47,7 +47,7 @@
         <dependency>
             <groupId>dnsjava</groupId>
             <artifactId>dnsjava</artifactId>
-            <version>2.1.7</version>
+            <version>2.1.8</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>