upgrade to 3.0.0.preview
diff --git a/pom.xml b/pom.xml
index 2473ff9..b1d0c33 100644
--- a/pom.xml
+++ b/pom.xml
@@ -38,7 +38,7 @@
     <properties>
         <maven_javadoc_version>3.0.1</maven_javadoc_version>
         <maven_surefire_version>2.19.1</maven_surefire_version>
-        <revision>3.0.0-SNAPSHOT</revision>
+        <revision>3.0.0.preview</revision>
     </properties>
 
     <modules>