Merge pull request #5 from apache/31

[MTOOLCHAINS-33] minimum Maven 3.1.0
diff --git a/pom.xml b/pom.xml
index d1762a3..da74f00 100644
--- a/pom.xml
+++ b/pom.xml
@@ -71,7 +71,7 @@
   </contributors>
 
   <properties>
-    <mavenVersion>3.0</mavenVersion>
+    <mavenVersion>3.1.0</mavenVersion>
     <javaVersion>7</javaVersion>
     <project.build.outputTimestamp>2020-04-07T21:04:00Z</project.build.outputTimestamp>
   </properties>