Mention async functions as part of ES2017 instead of ES7 (ES2016) + switch to "ES<year>/ES<edition>" when mentioning ECMAScript versions.
Mention async functions as part of ES2017 instead of ES7 (ES2016) + switch to "ES<year>/ES<edition>" when mentioning ECMAScript versions.

andersontr15/clean-code-javascript-es,DavidVujic/clean-code-javascript,ryanmcdermott/clean-code-javascript,greg-dev/clean-code-javascript-pl,HemantPawar/clean-code-javascript,chux0519/clean-code-javascript