Merge pull request #2159 from jupyterlab/0.20.x

Updates from 0.20.4 release

jupyterlab/_version.py

@@ -1,2 +1,2 @@
-version_info = (0, 20, 3)
+version_info = (0, 20, 4)
 __version__ = ".".join(map(str, version_info))

setup.py

@@ -114,7 +114,7 @@ setup_args['cmdclass'] = cmdclass
 setuptools_args = {}
 install_requires = setuptools_args['install_requires'] = [
     'notebook>=4.2.0',
-    'jupyterlab_launcher>=0.1.1'
+    'jupyterlab_launcher>=0.1.1,<0.2'
 ]
 
 extras_require = setuptools_args['extras_require'] = {