[regression] removing whitespace below shebang

[jamesbraza]

#!/usr/bin/env python

"""a.py"""

docformatter==1.6.3 (also may possibly be 1.6.2 per #186) is removing whitespace below a shebang.

> docformatter a.py leads to:

#!/usr/bin/env python
"""a.py"""

docformatter==1.5.1 didn't use to do that.