Allow enabling anonymous login (#85)

* Allow enabling anonymous login

* Align configuration name for anonymous login

---------

Co-authored-by: Dave Berenbaum <[email protected]>

Author: 2maz

dvc_s3/__init__.py

@@ -167,6 +167,7 @@ def _prepare_credentials(self, **config):
         # session configuration
         login_info["profile"] = config.get("profile")
         login_info["use_ssl"] = config.get("use_ssl", True)
+        login_info["anon"] = config.get("allow_anonymous_login")
 
         # extra client configuration
         client = login_info["client_kwargs"]