Fixed default http_scheme in Connection class from 'http' to 'https'

[akuzmichov]

Http scheme is not supported and raises a ValueError. Yet it is the default value that is set in Connection constructor. We should either make https the default (as in this pull request), or at least add a http_scheme='https' argument to dbapi.connect method in the quick start section of the readme.

[linux-foundation-easycla]

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• ❌ Andrei Kuzmichov (8dbcb02)

[linux-foundation-easycla]

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