Update cloudformation template for Node 6.1.0 end of life.

[Peter Wilson]

Node 6.1.0 will reach EOL on April 30, 2019.

Creating new functions using 6.1.0 will be disabled immediately, and updating existing functions will be disabled on AWS on May 30, 2019.

I can't find an online source but this is from their email:

The Node Foundation has previously published that node.js 6.x "Boron" will be declared End-of-Life (EOL) on April 2019 [1], and will stop receiving bug fixes, security updates, or performance improvements. Per the AWS Lambda runtime support policy [2], language runtimes that have reached their EOL are deprecated in AWS Lambda.

Invokes for functions configured to run on node.js 6.10 will continue to work normally, however the ability to create new Lambda functions configured to use the node.js 6.10 runtime will be disabled on April 30 2019. Code updates to existing functions using node.js 6.10 will be disabled 30 days later on May 30 2019

The run time support policy is quite vague about when invocations will be disabled for current functions:

After a runtime is deprecated, Lambda may retire it completely at any time by disabling invocation.