Upgraded maven gpg plugin version (#297)

Author: alexpalchuk

pom.xml

@@ -103,7 +103,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-gpg-plugin</artifactId>
-                <version>1.5</version>
+                <version>3.0.1</version>
                 <executions>
                     <execution>
                         <id>sign-artifacts</id>