docs: Mention the non-requirement to launch a Docker container (#5)

Author: borchero

README.md

@@ -4,8 +4,11 @@ GitHub Action to post the output of `terraform plan` to a pull request comment.
 
 ## Features
 
-- Generate a "markdown-native" representation of the plan including foldable sections and coloring
+- Generate a structured, "markdown-native" representation of the plan
+  - Obtain a high-level overview via foldable sections
+  - Do not lose _any_ information compared to the output of `terraform plan`
 - Post the plan to pull requests as a "sticky comment"
+- Run as a "native" JavaScript action rather than launching a Docker container
 - Use with or without the Terraform wrapper script provided by
   [hashicorp/setup-terraform](https://github.com/hashicorp/setup-terraform)