Pass 'filters' as a keyword argument to pyenchant get_tokenizer()
Pass 'filters' as a keyword argument to pyenchant get_tokenizer()

Fixes warnings during tests:

    .../spelling/sphinxcontrib/spelling/checker.py:34: DeprecationWarning: passing 'filters' as a non-keyword argument to get_tokenizer() is deprecated

Tracks upstream change:

https://github.com/pyenchant/pyenchant/commit/36930b55ac9881445a262a355af74c83ceef28e1

sphinx-contrib/spelling,sphinx-contrib/spelling