Updated Comptaibility for Tests

[01110011011101010110010001101111]

• Updated the tests to run by:
• using the correct import of EPSILON (copulas -> copulas.utils)
• updating pytest to use the latest syntax (assert_xxx)

Note that with the above update, test_propose_normalized_scores_lt_tunable_names fails. I currently skip the test and will investigate this in a future PR!

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}