Customise country-template through CI

Author: benjaminaaron

.github/PULL_REQUEST_TEMPLATE.md

@@ -11,7 +11,7 @@ Thanks for contributing to OpenFisca ! Please remove this line, as well as, for
 
 These changes _(remove lines which are not relevant to your contribution)_:
 
-- Impact the OpenFisca-Country-Template public API (for instance renaming or removing a variable)
+- Impact the OpenFisca-Germany public API (for instance renaming or removing a variable)
 - Add a new feature (for instance adding a variable)
 - Fix or improve an already existing calculation.
 - Change non-functional parts of this repository (for instance editing the README)