* Changes JDK from 7 to 8

* Removes redundant line of code from sample

Author: Chris Wilson

.travis.yml

@@ -1,3 +1,3 @@
 language: java
 jdk:
-- oraclejdk7
+- oraclejdk8

apps/sparkpost-samples-app/src/main/java/com/sparkpost/error/samples/SendEmailErrorSample.java

@@ -76,8 +76,6 @@ private void sendEmail(String from, String[] recipients) throws SparkPostExcepti
 
         transmission.setContentAttributes(contentAttributes);
 
-        transmission.setContentAttributes(contentAttributes);
-
         // Send the Email
         IRestConnection connection = new RestConnection(this.client, getEndPoint());