upgraded plugin version (#24)

Author: agamkrbit

pom.xml

@@ -146,7 +146,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-gpg-plugin</artifactId>
-                <version>1.5</version>
+                <version>3.1.0</version>
                 <executions>
                     <execution>
                         <id>sign-artifacts</id>
@@ -160,7 +160,6 @@
                     <gpgArguments>
                         <arg>--pinentry-mode</arg>
                         <arg>loopback</arg>
-                        <arg>--no-tty</arg>
                     </gpgArguments>
                 </configuration>
             </plugin>