Add ability to create feed within a group#125

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brentru merged 5 commits intoadafruit:masterfrom

brentru:specify-feed-in-group

Dec 21, 2020

Commits on Dec 21, 2020

addressing https://github.com/adafruit/Adafruit_IO_Python/issues/104
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add usage example
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add unittest
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bump ver
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reflect test expected
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