[pom] Still allow maven 3.1.0-alpha-1 to build with

Author: hazendaz

pom.xml

@@ -22,7 +22,7 @@
     </description>
 
     <prerequisites>
-        <maven>[${maven-plugin-api.version},)</maven>
+        <maven>[3.1.0-alpha-1,)</maven>
     </prerequisites>
 
     <licenses>