Upgrade to parent pom version 21 (#38)

djkevincr · lewismc · commit 3fddc7ce26aa · 2019-02-12T22:36:22.000-08:00
diff --git a/pom.xml b/pom.xml
@@ -17,7 +17,7 @@
   <parent>
     <groupId>org.apache</groupId>
     <artifactId>apache</artifactId>
-    <version>10</version>
+    <version>21</version>
   </parent>
 
   <groupId>org.apache.sdap</groupId>
