Fix travis build

adding flake8-rst to travis-36.yaml

reverting changes to requirements-optional-pip.txt
     pytables seems to be tables on PyPI
     [running ./scripts/convert_deps.py previously changed it]

Signed-off-by: Fabian Haase <[email protected]>

Author: FHaase

ci/requirements-optional-pip.txt

@@ -17,7 +17,7 @@ numexpr>=2.6.1
 openpyxl==2.5.5
 pyarrow
 pymysql
-pytables>=3.4.2
+tables
 pytest-cov
 pytest-xdist
 s3fs

ci/travis-36.yaml

@@ -10,6 +10,7 @@ dependencies:
   - feather-format
   - flake8>=3.5
   - flake8-comprehensions
+  - flake8-rst
   - gcsfs
   - geopandas
   - html5lib

pandas/core/accessor.py

@@ -206,7 +206,7 @@ def decorator(accessor):
 
     def __init__(self, pandas_object):  # noqa: E999
         ...
-        
+
 For consistency with pandas methods, you should raise an ``AttributeError``
 if the data passed to your accessor has an incorrect dtype.