Update README.md

Author: dacort

README.md

@@ -1,29 +1,19 @@
-Copyright 2011-2013 Amazon.com, Inc. or its affiliates. All Rights Reserved.
-
-Licensed under the Apache License, Version 2.0 (the "License"). You
-may not use this file except in compliance with the License. A copy of
-the License is located at
-
-http://aws.amazon.com/apache2.0/
-
-or in the "license" file accompanying this file. This file is
-distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF
-ANY KIND, either express or implied. See the License for the specific
-language governing permissions and limitations under the License.
-
-
 EMR bootstrap actions
 =====================
 
-A bootstrap action is a shell script stored in [Amazon S3](http://aws.amazon.com/s3/) that [Amazon EMR](http://aws.amazon.com/elasticmapreduce/) executes on every node of your cluster.
-Bootstrap actions execute as the `hadoop` user by default; they execute with root privileges if you use `sudo`.<br>From the [Ruby EMR Command Line Interface](http://docs.aws.amazon.com/ElasticMapReduce/latest/DeveloperGuide/emr-cli-reference.html) you can reference a bootstrap action as follows:
+> **Warning**: This repository is undergoing updating and modernization – please bear with us.
+
+A bootstrap action is a shell script stored in [Amazon S3](http://aws.amazon.com/s3/) that [Amazon EMR](https://aws.amazon.com/emr/) executes on every node of your cluster after boot and prior to application provisioning.
+Bootstrap actions execute as the `hadoop` user by default; commands can be executed with root privileges if you use `sudo`.
+
+From the [AWS CLI EMR `create-cluster` command](https://awscli.amazonaws.com/v2/documentation/api/latest/reference/emr/create-cluster.html) you can reference a bootstrap action as follows:
 
 
 ```sh
---bootstrap-action "s3://myawsbucket/FileName" --args "arg1,arg2"
+--bootstrap-actions Name=action-name,Path=s3://myawsbucket/FileName,Args=arg1,arg2
 ```
 
-For more information about EMR Bootstrap actions see [DeveloperGuide](http://docs.aws.amazon.com/ElasticMapReduce/latest/DeveloperGuide/emr-plan-bootstrap.html)
+For more information about EMR Bootstrap actions see [DeveloperGuide](https://docs.aws.amazon.com/emr/latest/ManagementGuide/emr-plan-bootstrap.html)
 
 The code samples in this repository are meant to illustrate how to setup popular applications on Amazon EMR using bootstrap actions.
 They are not meant to be run in production and all users should carefully inspect code samples before running them.