revert "revert "Update commons-parent from 42 to 43." because it breaks the build on java 6"

remove jdk6 travis build because it does not work with commons-parent 43



git-svn-id: https://svn.apache.org/repos/asf/commons/proper/net/trunk@1823089 13f79535-47bb-0310-9956-ffa450edef68

Author: PascalSchumacher

.travis.yml

@@ -16,10 +16,7 @@
 language: java
 sudo: false
 
-dist: precise
-
 jdk:
-  - openjdk6
   - openjdk7
   - oraclejdk8
 

pom.xml

@@ -22,7 +22,7 @@
     <parent>
         <groupId>org.apache.commons</groupId>
         <artifactId>commons-parent</artifactId>
-        <version>42</version>
+        <version>43</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <groupId>commons-net</groupId>