added a flask venv

flask/venv/lib/python3.6/site-packages/itsdangerous/_json.py

@@ -0,0 +1,18 @@
+try:
+    import simplejson as json
+except ImportError:
+    import json
+
+
+class _CompactJSON(object):
+    """Wrapper around json module that strips whitespace."""
+
+    @staticmethod
+    def loads(payload):
+        return json.loads(payload)
+
+    @staticmethod
+    def dumps(obj, **kwargs):
+        kwargs.setdefault("ensure_ascii", False)
+        kwargs.setdefault("separators", (",", ":"))
+        return json.dumps(obj, **kwargs)