feat: upgrade to serverless v3

BREAKING CHANGE: no longer support 2.x versions of serverless

Author: devpow112

.github/SECURITY.md

@@ -6,8 +6,8 @@ Currently only the latest stream is supported.
 
 | Version | Supported          |
 | ------- | ------------------ |
-|  1.3.x  | :white_check_mark: |
-|  < 1.3  | :x:                |
+|  >= 2   | :white_check_mark: |
+|  < 2    | :x:                |
 
 ## Reporting a Vulnerability
 

README.md

@@ -11,7 +11,9 @@
 
 Serverless framework plugin that will automatically generate AWS CloudFormation
 snippets to reference a functions **name**, **ARN** or **logical ID** value
-based on the internally generated Lambda logical ID.
+based on the internally generated Lambda logical ID. All **2.x** versions
+support only Serverless **3.x**. For Serverless **2.x** please use the **1.x**
+versions.
 
 ## Installation