Decorators are not linked, emit `RuntimeWarning`

[Zac-HD]

.. code:: python

    from functools import lru_cache

    @lru_cache
    def f(x): pass

    @lru_cache(maxsize=None)
    def f(x): pass

would ideally have lru_cache autolinked when used as a decorator, but instead we get:

sphinx_codeautolink/extension/block.py:224: 
	RuntimeWarning: Could not match transformation of `lru_cache` 
	on source line 3 <or line 6> in document "example.html", source:

from functools import lru_cache

@lru_cache
def f(x): pass

@lru_cache(maxsize=None)
def f(x): pass

I'm running Python 3.8, sphinx-codeautolink 0.2.1

[felix-hilden]

Thanks for the report, I'll work on this today! It's most likely due to the assumptions in our matching regex 👍

[felix-hilden]

Should. Not. Have. Skipped. eyeballing the documentation. Now we have @ signs all over 😅 Also, we need stricter tests.