update requiremets in setup.py to jupyterhub>=1.3 where async is used

Author: georgejhunt

firstuseauthenticator/firstuseauthenticator.py

@@ -138,7 +138,7 @@ def validate_username(self, name):
 
     @gen.coroutine
     def authenticate(self, handler, data):
-        username = data['username']
+        username = data['username'].lower()
 
         if not self.create_users:
             if not self._user_exists(username):

setup.py

@@ -19,7 +19,7 @@
     author_email='[email protected]',
     license='3 Clause BSD',
     packages=find_packages(),
-    install_requires=['bcrypt', 'jupyterhub>=0.8'],
+    install_requires=['bcrypt', 'jupyterhub>=1.3'],
     package_data={
         '': ['*.html'],
     },