Update compiler target as per request from @jonathanaustin

Author: Mark Reeves

pom.xml

@@ -13,8 +13,8 @@
 	<properties>
 		<surefireArgLine />
 		<surefire.version>2.22.0</surefire.version>
-		<maven.compiler.target>1.7</maven.compiler.target>
-		<maven.compiler.source>1.7</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
+		<maven.compiler.source>1.8</maven.compiler.source>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<stagingBaseUrl>https://oss.sonatype.org/</stagingBaseUrl>
 		<stagingUrl>${stagingBaseUrl}service/local/staging/deploy/maven2/</stagingUrl>