Add available regions

Author: rpidanny

README.md

@@ -17,3 +17,22 @@ arn:aws:lambda:eu-west-1:175033217214:layer:graphicsmagick:1
 | GraphicsMagick version | ARN |
 | --- | --- |
 | 1.3.31 | `arn:aws:lambda:<region>:175033217214:layer:graphicsmagick:1` |
+
+## Available Regions
+
+- `ap-northeast-1`
+- `ap-northeast-2`
+- `ap-south-1`
+- `ap-southeast-1`
+- `ap-southeast-2`
+- `ca-central-1`
+- `eu-north-1`
+- `eu-central-1`
+- `eu-west-1`
+- `eu-west-2`
+- `eu-west-3`
+- `sa-east-1`
+- `us-east-1`
+- `us-east-2`
+- `us-west-1`
+- `us-west-2`