Use scm.connection consistent with archetype (jenkinsci#1201)

Consistent is better

Author: MarkEWaite

pom.xml

@@ -47,7 +47,7 @@
 
   <scm>
     <connection>scm:git:https://github.com/${gitHubRepo}</connection>
-    <developerConnection>scm:git:git@github.com:${gitHubRepo}.git</developerConnection>
+    <developerConnection>scm:git:https://github.com/${gitHubRepo}</developerConnection>
     <tag>${scmTag}</tag>
     <url>https://github.com/${gitHubRepo}</url>
   </scm>