bumped maven-gpg-plugin version to 3.0.1

Author: kilmajster

pom.xml

@@ -69,7 +69,7 @@
 
         <java.version>1.8</java.version>
 
-        <maven-gpg-plugin.version>1.6</maven-gpg-plugin.version>
+        <maven-gpg-plugin.version>3.0.1</maven-gpg-plugin.version>
         <maven-javadoc-plugin.version>3.2.0</maven-javadoc-plugin.version>
         <maven-source-plugin.version>3.2.1</maven-source-plugin.version>