Update NodeJS from 8 to 10.x

NodeJS 8 is being deprecated in AWS Lambda

Message from AWS:

The Node community has decided to end support for Node.js 8.x on December 31, 2019. From this date forward, Node.js 8.x will stop receiving bug fixes, security updates, and/or performance improvements. To ensure that your new and existing functions run on a supported and secure runtime, language runtimes that have reached their EOL are deprecated in AWS.
i
For Node.js 8.x, there will be 2 stages to the runtime deprecation process:

1. Disable Function Create – Beginning January 6, 2020, customers will no longer be able to create functions using Node.js 8.10
2. Disable Function Update – Beginning February 3, 2020, customers will no longer be able to update functions using Node.js 8.10

.circleci/config.yml

@@ -4,7 +4,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: circleci/node:8.10
+      - image: circleci/node:10.16.3
     working_directory: ~/repo
 
     steps:

cloudformation.yaml

@@ -48,7 +48,7 @@ Resources:
     Properties:
       Handler: src/index.handler
       Role: !GetAtt FunctionRole.Arn
-      Runtime: nodejs8.10
+      Runtime: nodejs10.x
       MemorySize: 256
       Timeout: 15 # Cross-region metrics lookup requires at least 10s
       Code:

package.json

@@ -4,7 +4,7 @@
   "description": "Forward AWS Notification Messages to Slack",
   "main": "src/index.js",
   "engines": {
-    "node": ">=8.10.0"
+    "node": ">=10.16.3"
   },
   "scripts": {
     "test": "jest test",