Awscurl

Bugfix release to restore prior authentication behavior by reverting SSO profile changes

New features:
* SSO profiles
* Follow redirect support

Other improvements
* Various README updates
* Additional CI scripts

* Update encoding handling in response see https://github.com/okigan/awscurl/pull/92 for details

Change long:
* add support for MacOS brew package manager
* relax urllib3 version requirements

Changes:
* fix up url parsing (affects websocket connections url)
* Split up signature generation steps and add tests to allow for core code re-use in other projects
* Create LICENSE file and indicate MIT usage
* Fixup Dockerfile
* Add support non-English text data in printout of headers and response body
* Add python 3.8 as supported/tested python version