Use https:// (not git://) URLs

GitHub doesn't advertise git:// URLs anywhere, and we don't encourage using them. The preferred protocol for "Public URLs" is HTTPS.

Author: jdennes

user/customizing-the-build.md

@@ -430,7 +430,7 @@ If your project uses Git submodules, make sure you use public Git URLs. For exam
 
 use
 
-    git://github.com/someuser/somelibrary.git
+    https://github.com/someuser/somelibrary.git
 
 Otherwise, Travis CI builders won't be able to clone your project because they don't have your private SSH key.