Update README.md

Author: subinataws

README.md

@@ -8,24 +8,24 @@ The master branch will sometimes have changes that are still in the process of b
 
 ### How to build Docker images
 
-Steps to build Standard 2.0 image
+Steps to build Standard 4.0 image
 
 * Run `git clone https://github.com/aws/aws-codebuild-docker-images.git` to download this repository to your local machine
-* Run `cd ubuntu/standard/2.0` to change the directory in your local workspace. This is the location of the Standard 2.0 Dockerfile with Ubuntu base.
-* Run `docker build -t aws/codebuild/standard:2.0 .` to build Docker image locally
+* Run `cd ubuntu/standard/4.0` to change the directory in your local workspace. This is the location of the Standard 4.0 Dockerfile with Ubuntu base.
+* Run `docker build -t aws/codebuild/standard:4.0 .` to build Docker image locally
 
 To poke around in the image interactively, build it and run:
-`docker run -it --entrypoint sh aws/codebuild/standard:2.0 -c bash`
+`docker run -it --entrypoint sh aws/codebuild/standard:4.0 -c bash`
 
 To let the Docker daemon start up in the container, build it and run:
-`docker run -it --privileged aws/codebuild/standard:2.0 bash`
+`docker run -it --privileged aws/codebuild/standard:4.0 bash`
 
 ```
 $ git clone https://github.com/aws/aws-codebuild-docker-images.git
 $ cd aws-codebuild-docker-images
-$ cd ubuntu/standard/2.0
-$ docker build -t aws/codebuild/standard:2.0 .
-$ docker run -it --entrypoint sh aws/codebuild/standard:2.0 -c bash
+$ cd ubuntu/standard/4.0
+$ docker build -t aws/codebuild/standard:4.0 .
+$ docker run -it --entrypoint sh aws/codebuild/standard:4.0 -c bash
 ```
 
 ### Image maintenance
@@ -34,10 +34,8 @@ Some of the images in this repository are no longer actively maintained by AWS C
 
 The following images are actively maintained by AWS CodeBuild, and are listed in the CodeBuild console.
 
-+ [standard 2.0](ubuntu/standard/2.0)
 + [standard 3.0](ubuntu/standard/3.0)
 + [standard 4.0](ubuntu/standard/4.0)
-+ [amazonlinux2-x86_64-standard:1.0](al2/x86_64/standard/1.0)
 + [amazonlinux2-x86_64-standard:2.0](al2/x86_64/standard/2.0)
 + [amazonlinux2-x86_64-standard:3.0](al2/x86_64/standard/3.0)
 + [amazonlinux2-aarch64-standard:1.0](al2/aarch64/standard/1.0)