Add plugins#75

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treygriffith wants to merge 8 commits intosegmentio:masterfrom

treygriffith:plugins

Commits on Aug 21, 2020

add plugins for processing selectors and rules
treygriffith
committed

Commits on Aug 25, 2020

bump minor version to reflect new functionality
treygriffith
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Commits on Nov 7, 2020

Merge branch 'master' into plugins
treygriffith
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