git_url should not have https://

Author: nedtwigg

.travis.yml

@@ -1,7 +1,7 @@
 maven_name=durian-rx
 maven_group=com.diffplug.durian
 maven_desc=DurianRx: Reactive getters, powered by RxJava and ListenableFuture
-git_url=https://github.com/diffplug/durian-rx
+git_url=github.com/diffplug/durian-rx
 osgi_symbolic_name=com.diffplug.durian.rx
 osgi_export=com.diffplug.common.rx.*
 license=apache