Sphinx 1.6.2 is also broken (#3627)

diff --git a/setup.py b/setup.py
index b134e0a..9160fa5 100644
--- a/setup.py
+++ b/setup.py
@@ -301,7 +301,7 @@
             "doc8",
             "pyenchant",
             "readme_renderer >= 16.0",
-            "sphinx != 1.6.1",
+            "sphinx != 1.6.1, != 1.6.2",
             "sphinx_rtd_theme",
             "sphinxcontrib-spelling",
         ],