Edgegrid-python

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- update requests dependency version

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- use pyopenssl to improve security as per https://urllib3.readthedocs.org/en/latest/security.html#pyopenssl

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- support passing in EdgeRc to from_edgerc static method
- fix problem with following redirects

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- support 'Host' header more transparently
- remove testurl since new 'Host' support handles the same case
- support edgerc file

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- support python3

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- update link to developer site