fix regex to accept negative timezone
{'login': 'jadermcs', 'id': 7156771, 'node_id': 'MDQ6VXNlcjcxNTY3NzE=', 'avatar_url': 'https://avatars.githubusercontent.com/u/7156771?v=4', 'gravatar_id': '', 'url': 'https://api.github.com/users/jadermcs', 'html_url': 'https://github.com/jadermcs', 'followers_url': 'https://api.github.com/users/jadermcs/followers', 'following_url': 'https://api.github.com/users/jadermcs/following{/other_user}', 'gists_url': 'https://api.github.com/users/jadermcs/gists{/gist_id}', 'starred_url': 'https://api.github.com/users/jadermcs/starred{/owner}{/repo}', 'subscriptions_url': 'https://api.github.com/users/jadermcs/subscriptions', 'organizations_url': 'https://api.github.com/users/jadermcs/orgs', 'repos_url': 'https://api.github.com/users/jadermcs/repos', 'events_url': 'https://api.github.com/users/jadermcs/events{/privacy}', 'received_events_url': 'https://api.github.com/users/jadermcs/received_events', 'type': 'User', 'site_admin': False}
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fix #2846
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{'url': 'https://api.github.com/repos/huggingface/datasets/pulls/2847', 'html_url': 'https://github.com/huggingface/datasets/pull/2847', 'diff_url': 'https://github.com/huggingface/datasets/pull/2847.diff', 'patch_url': 'https://github.com/huggingface/datasets/pull/2847.patch', 'merged_at': '2021-09-07T09:34:23Z'}