Use ssh in mvn release plugin

Author: glibas

pom.xml

@@ -23,7 +23,7 @@
     </licenses>
     <scm>
         <url>https://github.com/assertthat/assertthat-bdd-standalone</url>
-        <connection>scm:git:git://github.com/assertthat/assertthat-bdd-standalone.git</connection>
+        <connection>scm:git:git@github.com:assertthat/assertthat-bdd-standalone.git</connection>
         <developerConnection>scm:git:git@github.com:assertthat/assertthat-bdd-standalone.git</developerConnection>
         <tag>v1.5</tag>
   </scm>