Switch to newer click (2.0)

flask/cli.py

@@ -192,11 +192,11 @@ def without_appcontext(f):
     return f
 
 
-def set_debug_value(ctx, value):
+def set_debug_value(ctx, param, value):
     ctx.ensure_object(ScriptInfo).debug = value
 
 
-def set_app_value(ctx, value):
+def set_app_value(ctx, param, value):
     if value is not None:
         if os.path.isfile(value):
             value = prepare_exec_for_file(value)

setup.py

@@ -100,7 +100,7 @@ setup(
         'Werkzeug>=0.7',
         'Jinja2>=2.4',
         'itsdangerous>=0.21',
-        'click>=0.6',
+        'click>=2.0',
     ],
     classifiers=[
         'Development Status :: 4 - Beta',