diff --git a/ci/requirements-optional-pip.txt b/ci/requirements-optional-pip.txt
index bdee3567fa2ca..ebe0c4ca88ee6 100644
--- a/ci/requirements-optional-pip.txt
+++ b/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
diff --git a/ci/travis-36.yaml b/ci/travis-36.yaml
index 7aa27beacf976..89f2aa2251383 100644
--- a/ci/travis-36.yaml
+++ b/ci/travis-36.yaml
@@ -10,6 +10,7 @@ dependencies:
   - feather-format
   - flake8>=3.5
   - flake8-comprehensions
+  - flake8-rst
   - gcsfs
   - geopandas
   - html5lib
diff --git a/pandas/core/accessor.py b/pandas/core/accessor.py
index 59f21ddfb3d3f..6694737737562 100644
--- a/pandas/core/accessor.py
+++ b/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.