Github/__init__.py: Update GitHubToken headers

Keshav Gargrequested to merge
(removed):send-github-token-in-headers into master

Last year GitHub deprecated sending access token in request query parameters which does make sense, because they might raise security concerns. So, the deprecation will be bring into action and will be removed permanently on 8th September 2021. So, to continue working with GitHub APIs send access token in request API headers and return None in auth property.

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