fix linting

examples/PennTreebank/READER.md

+
+# LSTM language modeling on Penn Treebank dataset
+
+This example is mainly to demonstrate:
+1. How to train an RNN with persistent state between iterations.
+2. How to use a TF reader pipeline instead of a DataFlow for training & inference.
+
+More information to come.

examples/PennTreebank/reader.py

@@ -12,6 +12,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # ==============================================================================
+# flake8: noqa
 
 
 """Utilities for parsing PTB text files."""