Support for linting executable scripts

[Hawk777]

In #55, you said to lint files that do not end in .py (such as executable scripts with no file extension), to pass --force. According to the changelog, in version 8.1.4, that option went away. In actual fact, passing --force on the command line now fails, but passing force=True to pylama.main.parse_options silently succeeds but has no effect, meaning that non-.py files are silently not linted.

As far as I can tell, with --force gone, there is no longer any sane way to use Pylama to lint a bunch of executable scripts whose filenames do not end in .py. Am I just supposed to call pylama.core.run instead (which is not obviously a public API)? Or am I supposed to call pylama.main.check_paths, but pass in the code parameter and a fake filename ending in .py (which also infects the linter error messages)?