Remove deprecated parent and update Sonatype plugin

Author: dmitry-mukhin

pom.xml

@@ -7,12 +7,6 @@
     <version>3.3.1</version>
     <packaging>jar</packaging>
 
-    <parent>
-        <groupId>org.sonatype.oss</groupId>
-        <artifactId>oss-parent</artifactId>
-        <version>7</version>
-    </parent>
-
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
@@ -199,7 +193,7 @@
             <plugin>
               <groupId>org.sonatype.plugins</groupId>
               <artifactId>nexus-staging-maven-plugin</artifactId>
-              <version>1.6.6</version>
+              <version>1.6.8</version>
               <extensions>true</extensions>
               <configuration>
                  <serverId>ossrh</serverId>