chore(#85): revert version bump to be able to release

Author: ingogriebsch

pom.xml

@@ -223,7 +223,7 @@
                 <plugin>
                     <groupId>org.sonatype.plugins</groupId>
                     <artifactId>nexus-staging-maven-plugin</artifactId>
-                    <version>1.6.11</version>
+                    <version>1.6.8</version>
                 </plugin>
                 <plugin>
                     <groupId>net.revelc.code</groupId>