The imp module is deprecated in favour of importlib;

It seems this line needs to be updated:

https://github.com/flasgger/flasgger/blob/ce98b046cbec2b2eb8c6de6df4b5409c06a8e539/flasgger/utils.py#L5

  File "/usr/local/Cellar/python@3.8/3.8.2/Frameworks/Python.framework/Versions/3.8/lib/python3.8/imp.py", line 31, in <module>
    warnings.warn("the imp module is deprecated in favour of importlib; "
DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses

produced using: PYTHONWARNINGS=error in a flask project that uses flasgger.

[StefanBrand]

Using pytest I get:

../usr/local/lib/python3.8/site-packages/flasgger/utils.py:5
  /usr/local/lib/python3.8/site-packages/flasgger/utils.py:5: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    import imp
-- Docs: https://docs.pytest.org/en/stable/warnings.html

Edit: imp is being used in this line:

https://github.com/flasgger/flasgger/blob/ce98b046cbec2b2eb8c6de6df4b5409c06a8e539/flasgger/utils.py#L568

The imp docs say the following:

<span class="versionmodified deprecated">Deprecated since version 3.3: </span>Use <span class="pre">importlib.util.find_spec()</span> instead unless Python 3.3 compatibility is required, in which case use <span class="pre">importlib.find_loader()</span>. For example usage of the former case, see the <span class="std std-ref">Examples</span> section of the <span class="pre">importlib</span> documentation.

[mehdies7]

I still get this warning on V0.9.5