fixed source URL in README

README.md

@@ -5,7 +5,7 @@ Simple Terraform module to provide pre-defined Stanford University network range
 This module requires no variables / parameters to be defined:
 
     module "su_networks" {
-      source = "git://code.stanford.edu/tf_modules/su_networks.git"
+      source = "git::https://code.stanford.edu/tf_modules/su_networks.git"
     }
 
 ## Usage