Update shopify.php#7

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jason-engage wants to merge 5 commits intophpish:masterfrom

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Commits on Jan 11, 2017

Update shopify.php
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Commits on Jul 7, 2017

Update README.md
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Commits on Aug 24, 2017

Update shopify.php
jason-engage
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Commits on Mar 1, 2018

Updated Timeouts
jason-engage
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Commits on Jul 22, 2018

Adding more exceptions
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