Fix pom.xml warning

[ERROR] Project requires an incorrect minimum version of Maven.
[ERROR] Either change plugin versions to those compatible with 3.0.1
[ERROR] or update the pom.xml to contain
[ERROR]     <prerequisites>
[ERROR]       <maven>3.0.3</maven>
[ERROR]     </prerequisites>

Change-Id: I022bc7201d8c2324c5840710f51185c88441fb8d
diff --git a/pom.xml b/pom.xml
index 8815908..3bbdb70 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,7 +20,7 @@
     <modelVersion>4.0.0</modelVersion>
 
     <prerequisites>
-        <maven>3.0.1</maven>
+        <maven>3.0.3</maven>
     </prerequisites>
 
     <parent>