Add nexus-staging-maven-plugin

Partially reverts f109a97.

Author: gaul

pom.xml

@@ -248,6 +248,17 @@
           <includeTestClasses>false</includeTestClasses>
         </configuration>
       </plugin>
+      <plugin>
+        <groupId>org.sonatype.plugins</groupId>
+        <artifactId>nexus-staging-maven-plugin</artifactId>
+        <version>1.7.0</version>
+        <extensions>true</extensions>
+        <configuration>
+          <serverId>ossrh</serverId>
+          <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+          <autoReleaseAfterClose>true</autoReleaseAfterClose>
+        </configuration>
+      </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-site-plugin</artifactId>