Disable a conflicting PEP257 docstring requirement

As per prospector-dev/prospector#155
There is a contradiction between D203 and D211, since the most
of pywinaut classes has a blank line before the class docstring
we disable D211

.landscape.yml

@@ -1,12 +1,15 @@
-doc-warnings: yes
-test-warnings: no
-strictness: medium
-max-line-length: 120
-autodetect: yes
-requirements:
-    - dev-requirements.txt
-ignore-paths:
-    - apps
-    - sandbox
-    - docs
-    - pywinauto/unittests
+doc-warnings: yes
+test-warnings: no
+strictness: medium
+max-line-length: 120
+autodetect: yes
+requirements:
+    - dev-requirements.txt
+ignore-paths:
+    - apps
+    - sandbox
+    - docs
+    - pywinauto/unittests
+pep8:
+  disable:
+      - D211