Merge pull request #127 from donbourne/update_compiler_source_target

update mvn compiler source and target versions to 11

Author: mbroz2

pom.xml

@@ -13,8 +13,8 @@
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-    <maven.compiler.source>1.8</maven.compiler.source>
-    <maven.compiler.target>1.8</maven.compiler.target>
+    <maven.compiler.source>11</maven.compiler.source>
+    <maven.compiler.target>11</maven.compiler.target>
     <!-- Plugin versions -->
     <version.liberty-maven-plugin>3.7.1</version.liberty-maven-plugin>
     <version.maven-failsafe-plugin>3.0.0</version.maven-failsafe-plugin>