Limit to tornado <6 for now

Tornado 6.0a1 is causing test failures in CI
jupyter-server · Sep 25, 2019 · c1c393c · c1c393c
1 parent 41fd432
commit c1c393c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/setup.py b/setup.py
@@ -74,7 +74,7 @@
     zip_safe = False,
     install_requires = [
         'jinja2',
-        'tornado>=4',
+        'tornado>=4, <6',
         # pyzmq>=17 is not technically necessary,
         # but hopefully avoids incompatibilities with Tornado 5. April 2018
         'pyzmq>=17',