📚 Add post about lock files

README.md

@@ -150,6 +150,7 @@ You can find some of his previous talks here:
 - 🇺🇸 [How to Build a CLI in Node.js](https://www.twilio.com/blog/how-to-build-a-cli-with-node-js) | March 19, 2019
 - 🇺🇸 [Send Images and Other Media via WhatsApp Using Node.js](https://d-k.im/whatsapp-images-nodejs) | April 16, 2019
 - 🇺🇸 [A Guide to Node.js Logging](https://www.twilio.com/blog/guide-node-js-logging) | May 6, 2019
+- 🇺🇸 [When Not to Use Lock Files with Node.js](https://www.twilio.com/blog/lockfiles-nodejs) | May 17, 2019
 
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