Merge pull request #4712 from rtfd/humitos/lint/py2

Lint requirement file for py2

Author: humitos

requirements/lint.txt

@@ -1,8 +1,15 @@
 -r pip.txt
+# We need these special cases of Python < 3 for Read the Docs
+# corporate site.
 astroid==2.0.4; python_version > '3'
 astroid==1.6.4; python_version < '3'
-pylint==2.1.1
-pylint-django==2.0.2
+
+pylint==2.1.1; python_version > '3'
+pylint<2; python_version < '3'
+
+pylint-django==2.0.2; python_version > '3'
+pylint-django==0.11.1; python_version < '3'
+
 pylint-celery==0.3
 prospector==1.1.2
 pyflakes==2.0.0