pep8speaks (#2462)

* yml for pep8speaks

* Updated yml

* Intensionally added a badly styled scripts

* experimentally removed yml

* .yml file taken from pandas-dev/pandas/.pep8speaks.yml

* Undo inteded pep8 violation

Author: fujiisoup

.pep8speaks.yml

@@ -0,0 +1,11 @@
+# File : .pep8speaks.yml
+
+scanner:
+    diff_only: True  # If True, errors caused by only the patch are shown
+
+pycodestyle:
+    max-line-length: 79
+    ignore:  # Errors and warnings to ignore
+        - E402,  # module level import not at top of file
+        - E731,  # do not assign a lambda expression, use a def
+        - W503   # line break before binary operator