fix: fix missing Salesforce copyright header, bump to 2020

salesforce / kagekiri

Shadow DOM-piercing query APIs for the browser.

BSD 3-Clause "New" or "Revised" License

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Closed nolanlawson closed 4 years ago

nolanlawson commented 4 years ago

A couple files were missing this header, and I assume we should also bump it from 2019 to 2020.