fix preparation goals as its need artifacts

Signed-off-by: Olivier Lamy <olamy@apache.org>

Author: olamy

pom.xml

@@ -49,6 +49,7 @@
     <aspectj.version>1.9.7.M3</aspectj.version>
     <errorprone.version>2.11.0</errorprone.version>
     <trimStackTrace>false</trimStackTrace>
+    <preparationGoals>clean install</preparationGoals>
   </properties>
 
   <dependencyManagement>