Reduces enforcer versions.

Author: LorenzBuehmann

pom.xml

@@ -53,7 +53,8 @@
   <properties>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
-    <maven.version>3.3.9</maven.version>
+    <maven.version>>=3.0</maven.version>
+    <java.version>>=1.8</java.version>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <scala.version>2.11.8</scala.version>
     <scala.binary.version>2.11</scala.binary.version>