fix URL helidonm.io > helidon.io (helidon-io#10)

Author: romain-grecourt

pom.xml

@@ -29,7 +29,7 @@
 
     <description>Java libraries for writing microservices</description>
 
-    <url>https://helidonm.io</url>
+    <url>https://helidon.io</url>
 
     <organization>
         <name>Oracle Corporation</name>