Merge pull request #19 from praw-dev/state-docs

State docs

asyncprawcore/auth.py

@@ -51,8 +51,9 @@ def authorize_url(self, duration, scopes, state, implicit=False):
             is set to ``True``.
         :param scopes: A list of OAuth scopes to request authorization for.
         :param state: A string that will be reflected in the callback to
-            ``redirect_uri``. This value should be temporarily unique to the
-            client for whom the URL was generated for.
+            ``redirect_uri``. Elements must be printable ASCII characters in the range
+            0x20 through 0x7E inclusive. This value should be temporarily unique to the
+            client for whom the URL was generated.
         :param implicit: (optional) Use the implicit grant flow (default:
             False). This flow is only available for UntrustedAuthenticators.