Travis cannot checkout a repo where schematron is a submodule

[jdvorak001]

I'm trying to import 'schematron' as a submodule dependency into a my project (https://github.com/openaire/guidelines-cris-managers/tree/add-schematron-rules). While this basically works per se, I get a failure checking out the trunk/schematron/test submodule (sub-submodule to my project).

The problem seems to lie in the test submodule's URL. [email protected] is probably too tightly integrated with the development environment of the submitter of #49. I'll submit a pull request to change this into an https: URL.