add xrp

[cj4c0b1]

No description provided.

[peshay]

Thanks for your PR. Can you also add the new currency in the test cases here:
https://github.com/peshay/btcde/blob/ad2fe1b60a8931dca541732c2e01224da6e43a14/tests/test_btcde_func.py#L488C5-L488C5

[cj4c0b1]

Done

[cj4c0b1]

====================================================================================================== test session starts ======================================================================================================
platform linux -- Python 3.11.2, pytest-7.4.0, pluggy-1.2.0
rootdir: /home/j4c0b1/btcde
plugins: requests-mock-1.11.0
collected 44 items

tests/test_btcde_func.py ............................................ [100%]

======================================================================================================= warnings summary ========================================================================================================
tests/test_btcde_func.py::TestBtcdeExceptions::test_RequestException
/home/j4c0b1/btcde/.venv/lib/python3.11/site-packages/urllib3/connectionpool.py:1095: InsecureRequestWarning: Unverified HTTPS request is being made to host 'api.bitcoin.de'. Adding certificate verification is strongly advised. See: https://urllib3.readthedocs.io/en/latest/advanced-usage.html#tls-warnings
warnings.warn(

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================================================================= 44 passed, 1 warning in 1.29s =================================================================================================