flake8-rst 0.4.3 config?
With `flake8-rst` 0.4.2 the output of `flake8-rst doc/source --filename="*.rst"` is clean.

With 0.4.3, I see a bunch of failures like

```
doc/source/install.rst:226:14: E999 SyntaxError: invalid syntax
doc/source/sparse.rst:9:4: E402 module level import not at top of file
doc/source/sparse.rst:10:4: E402 module level import not at top of file
doc/source/sparse.rst:10:4: F401 'pandas.util.testing as tm' imported but unused
doc/source/sparse.rst:97:21: E702 multiple statements on one line (semicolon)
doc/source/sparse.rst:247:41: E127 continuation line over-indented for visual indent
doc/source/comparison_with_r.rst:8:4: F401 'numpy as np' imported but unused
doc/source/comparison_with_r.rst:9:31: E225 missing whitespace around operator
doc/source/comparison_with_r.rst:169:6: E121 continuation line under-indented for hanging indent
doc/source/comparison_with_r.rst:169:14: E231 missing whitespace after ','
```

cc @datapythonista will we need some `exclude`s in the `flake8-rst` section of `setup.cfg`?