missing conversion of dependency markers

[bnavigator]

The clikit dependency on typing extensions reads:

[tool.poetry.dependencies]
typing-extensions = { version = "^3.6", markers = 'python_version >= "3.5" and python_full_version < "3.5.4"' }

But dephell deps convert --traceback --level=INFO --from pyproject.toml --to-format setuppy --to-path setup.py produces

install_requires=[ ... 'typing-extensions==3.*,>=3.6.0']

essentially requiring typing-extensions for every Python version, when it shouldn't.