Provide config arg to quiet warning from meta() (#12)
Provide config arg to quiet warning from meta() (#12)

The call to `setuptools_scm.version.meta()` is made here without providing an arg value for `config`, which always generates a warning from this code:

https://github.com/pypa/setuptools_scm/blob/7b21089a545667f0ae7852e1039f8028be288f48/src/setuptools_scm/version.py#L198

Example for a package downloaded from GitHub as a release zipfile:
```
(install-test37) ➜  proseco-4.8.0 python setup.py --version
/Users/aldcroft/Downloads/proseco-4.8.0/.eggs/setuptools_scm-3.5.0-py3.7.egg/setuptools_scm/version.py:200: UserWarning: meta invoked without explicit configuration, will use defaults where required.
  "meta invoked without explicit configuration,"
4.8.0
```

This warning is confusing and makes users wonder if there is a real problem that needs attention, e.g. #8.
Changaco/setuptools_scm_git_archive