Updated README to explain the two images

Author: cliff-wakefield-acurus

README.md

@@ -8,10 +8,15 @@ module may not be compatible with the Amazon Lambda execution environment.
 A common solution to this problem is to build the package on an EC2 instance using an Amazon Linux AMI and then to
 deploy it in Amazon Lambda. Building serverless applications, it is ironic to be obliged to use an EC2 server to deploy code.
 
-This docker image is based on the [Amazon Linux 1](https://hub.docker.com/_/amazonlinux/) image and contains `gcc`,
-`python 2.7`, `python 3.6`, `python 3.7`, `pip`, `node 6.10`, `node 8.10` to create packages for Amazon Lambda.
+This docker image is based on the [Amazon Linux](https://hub.docker.com/_/amazonlinux/) image and contains `gcc`.
 
-Using the docker image `myrmex/lambda-packager`, you can avoid errors like these during execution in Amazon Lambda:
+The AWS lambda [runtimes](https://docs.aws.amazon.com/lambda/latest/dg/lambda-runtimes.html) are now split between `Amazon Linux` and `Amazon Linux 2` execution environments.
+
+The docker image for `Amazon Linux` now contains `python 2.7`, `python 3.6`, `python 3.7`, `pip`, `node 6.10`, `node 8.10` to create packages for Amazon Lambda.
+
+The docker image for `Amazon Linux 2` now contains `node 10.15` to create packages for Amazon Lambda.
+
+Using the docker images from `myrmex/lambda-packager`, you can avoid errors like these during execution in Amazon Lambda:
 
 ```
 /var/lang/lib/libstdc++.so.6: version `GLIBCXX_3.4.21' not found (required by /var/task/node_modules/bcrypt/lib/binding/bcrypt_lib.node)
@@ -21,6 +26,24 @@ Using the docker image `myrmex/lambda-packager`, you can avoid errors like these
 Module version mismatch. Expected 46, got 48.
 ```
 
+## Building
+
+To build the required images standard `Dockerfile` have been included one for `Amazon Linux` and another for `Amazon Linux 2`.
+
+To build the `Amazon Linux` image that supports node 6.10, node 8.10, python 2.7, python 3.6 and python 3.7
+
+```bash
+cd Amazon\ Linux
+docker build -t myrmex/lambda-packager .
+```
+
+To build the `Amazon Linux 2` image that supports node 10.15
+
+```bash
+cd Amazon\ Linux\ 2
+docker build -t myrmex/lambda-packager:amazonlinux2 .
+```
+
 ## Usage
 
 You can use a docker volume to mount the code of the Lambda in a container. The directory where `npm install` or
@@ -51,10 +74,21 @@ docker run -e HOST_UID=`id -u` -e HOST_GID=`id -g` -v `pwd`:/data myrmex/lambda-
 
 The `RUNTIME` environment variable allows to choose the runtime.
 
+### Node 10.15
+
+Node 10.15 is the default runtime for `Amazon Linux 2` and does not require any special configuration.
+
+```bash
+docker run -v `pwd`:/data myrmex/lambda-packager:amazonlinux2
+```
 
 #### Node 8.10
 
-Node 8.10 is the default runtime and does not require any special configuration.
+Node 8.10 is the default runtime for `Amazon Linux` and does not require any special configuration.
+
+```bash
+docker run -v `pwd`:/data myrmex/lambda-packager
+```
 
 #### Node 6.10