Document supported regions

Author: Steve Willard

README.md

@@ -56,6 +56,26 @@ Log streaming is enabled for NodeJS Lambda functions via the [AWS Lambda Extensi
 
 <br />
 
+## Supported regions
+- us-east-1
+- us-east-2
+- us-west-2
+- eu-central-1
+- eu-west-1
+- eu-west-2
+- eu-west-3
+- eu-north-1
+- ap-northeast-1
+- ap-northeast-2
+- ap-southeast-1
+- ap-southeast-2
+- ap-south-1
+- ca-central-1
+- sa-east-1
+- us-west-1
+
+<br />
+
 ## Supported resources
 
 - AWS Lambda