Description of problem:
when running rpmdeplint DeprecationWarning messages are shown, like:

/usr/lib64/python3.8/site-packages/hawkey/__init__.py:348: DeprecationWarning: The class hawkey.Repo is deprecated. Please use dnf.repo.Repo instead. The class will be removed on 2019-12-31.
  warnings.warn(msg, DeprecationWarning)
/usr/lib/python3.8/site-packages/rpmdeplint/__init__.py:249: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
  logger.warn('Ignoring pre-existing repoclosure problem: %s', problem_msg)


Version-Release number of selected component (if applicable):
rpmdeplint-1.4-13.fc32.noarch

How reproducible:
100%

Steps to Reproduce:
1.Download rpms from some recent koji build:
koji download-build --arch x86_64 --arch noarch --arch i686 --noprogress --debuginfo knot-2.9.4-1.fc32
2.Run rpmdeplint
rpmdeplint check-repoclosure --repo Fedora-32-repo,https://kojipkgs.fedoraproject.org/compose/branched/latest-Fedora-32/compose/Everything/x86_64/os --repo koji-f32-repo,https://kojipkgs.fedoraproject.org/repos/f32-build/latest/x86_64  --arch=x86_64 *.rpm


Actual results:
# rpmdeplint check-repoclosure --repo Fedora-32-repo,https://kojipkgs.fedoraproject.org/compose/branched/latest-Fedora-32/compose/Everything/x86_64/os --repo koji-f32-repo,https://kojipkgs.fedoraproject.org/repos/f32-build/latest/x86_64  --arch=x86_64 *.rpm
/usr/lib64/python3.8/site-packages/hawkey/__init__.py:348: DeprecationWarning: The class hawkey.Repo is deprecated. Please use dnf.repo.Repo instead. The class will be removed on 2019-12-31.
  warnings.warn(msg, DeprecationWarning)
/usr/lib64/python3.8/site-packages/hawkey/__init__.py:348: DeprecationWarning: The class hawkey.Repo is deprecated. Please use dnf.repo.Repo instead. The class will be removed on 2019-12-31.
  warnings.warn(msg, DeprecationWarning)
/usr/lib/python3.8/site-packages/rpmdeplint/__init__.py:249: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
  logger.warn('Ignoring pre-existing repoclosure problem: %s', problem_msg)
2020-05-06 09:16:25,139 rpmdeplint WARNING Ignoring pre-existing repoclosure problem: nothing provides mvn(net.iharder:base64) needed by Java-WebSocket-1.3.8-4.fc31.noarch
/usr/lib/python3.8/site-packages/rpmdeplint/__init__.py:249: DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
  logger.warn('Ignoring pre-existing repoclosure problem: %s', problem_msg)
<snip>

Expected results:
no DeprecationWarning messages