Fixes copy paste for Logger name.

Author: yepher

apps/sparkpost-samples-app/src/main/java/com/sparkpost/samples/SendEmailWithSubstitutionSample.java

@@ -23,7 +23,7 @@
 
 public class SendEmailWithSubstitutionSample extends SparkPostBaseApp {
 
-    static final Logger logger = Logger.getLogger(CreateTemplateSimple.class);
+    static final Logger logger = Logger.getLogger(SendEmailWithSubstitutionSample.class);
 
     private Client client;