Fix os-maven-plugin extension version (#21)

Author: Amir-Golmoradi

pom.xml

@@ -77,7 +77,7 @@
             <extension>
                 <groupId>kr.motd.maven</groupId>
                 <artifactId>os-maven-plugin</artifactId>
-                <version>${os.maven.plugin.version}</version>
+                <version>1.7.1</version>
             </extension>
         </extensions>
         <plugins>