Upgrade Maven Plugins and Configuration

Author: KarstenSchnitter

pom.xml

@@ -128,17 +128,18 @@
         <slf4j.version>1.7.25</slf4j.version>
         <logback.version>1.2.3</logback.version>
         <log4j2.version>2.8.2</log4j2.version>
-        <buildnumber.plugin.version>1.3</buildnumber.plugin.version>
-        <source.plugin.version>2.4</source.plugin.version>
-        <jar.plugin.version>2.4</jar.plugin.version>
+        <buildnumber.plugin.version>1.4</buildnumber.plugin.version>
+        <source.plugin.version>3.2.1</source.plugin.version>
+        <jar.plugin.version>3.2.0</jar.plugin.version>
         <hamcrest.version>1.3</hamcrest.version>
         <junit.version>4.12</junit.version>
         <mockito.version>1.9.5</mockito.version>
         <surefire.plugin.version>2.18.1</surefire.plugin.version>
         <animal.sniffer.version>1.18</animal.sniffer.version>
         <exec.plugin.version>1.4.0</exec.plugin.version>
-        <javadoc.plugin.version>2.10.3</javadoc.plugin.version>
-        <gpg.plugin.version>1.5</gpg.plugin.version>
+        <javadoc.plugin.version>3.1.1</javadoc.plugin.version>
+        <gpg.plugin.version>1.6</gpg.plugin.version>
+        <maven.compiler.release>8</maven.compiler.release>
     </properties>
 
     <modules>