Update layer ARN in example in README

Author: TheTeaCat

README.md

@@ -135,10 +135,10 @@ The latest extension version of the publically accessible Lambda Layer published
 arn:aws:lambda:us-east-1:247286868737:layer:firetail-extension-${ARCH}-${VERSION}:1
 ```
 
-For example, for `ARCH=arm64` and `VERSION=v1-0-0` this should yield:
+For example, for `ARCH=amd64` and `VERSION=v1-0-5` this should yield:
 
 ```
-arn:aws:lambda:us-east-1:247286868737:layer:firetail-extension-x86_64-v1-0-4:1
+arn:aws:lambda:us-east-1:247286868737:layer:firetail-extension-x86_64-v1-0-5:1
 ```
 
 Regardless of how you add the Lambda Layer to your Lambda Function, you will also need to configure at least one environment variable: `FIRETAIL_API_TOKEN`. Find below a full list of the environment variables used by the Firetail Lambda Extension: