Depricated link to example "paths.rb" file

[jakobscholz]

The error Message that shows up when testing "I go to [statement]" against a statement that is not yet linked to a path in "paths.rb" contains a depricated link. The whole message is "Add and require a paths.rb file (compare https://github.com/makandra/spreewald/examples/paths.rb) (RuntimeError)"

The link should be "https://github.com/makandra/spreewald/blob/master/examples/paths.rb"