Add Node.js 16.x pattern to environment check

Author: smithki

src/util/isLambdaRuntimeEnvironment.ts

@@ -1,5 +1,8 @@
 export default function isLambdaRuntimeEnvironment(): boolean {
-  return ['AWS_Lambda_nodejs10.x', 'AWS_Lambda_nodejs12.x', 'AWS_Lambda_nodejs14.x'].includes(
-    process.env.AWS_EXECUTION_ENV as string
-  );
+  return [
+    'AWS_Lambda_nodejs10.x',
+    'AWS_Lambda_nodejs12.x',
+    'AWS_Lambda_nodejs14.x',
+    'AWS_Lambda_nodejs16.x',
+  ].includes(process.env.AWS_EXECUTION_ENV as string);
 }