fix(checks): change the expected node version

By default Twilio Functions will now create environments using Node.js 10.17 instead of 8.10. This
updates the checks, tests and docs

Author: dkundel

.nvmrc

@@ -1 +1 @@
-8.10
+10.17

.travis.yml

@@ -2,9 +2,8 @@ language: node_js
 
 node_js:
   - 'stable'
-  - '8'
-  - '9'
   - '10'
+  - '12'
 
 sudo: false
 

CONTRIBUTING.md

@@ -12,8 +12,8 @@ This project contains the CLI aspects of deploying Twilio Serverless as well as
 
 ## Requirements
 
-Make sure you have Node.js 8.10 or newer installed. Due to compatibility with Twilio
-Functions this project has to support at least Node.js 8.10.
+Make sure you have Node.js 10.17 or newer installed. Due to compatibility with Twilio
+Functions this project has to support at least Node.js 10.17.
 
 ## Setup
 

src/checks/nodejs-version.ts

@@ -1,7 +1,7 @@
 import { stripIndent } from 'common-tags';
 import { logger } from '../utils/logger';
 
-const SERVERLESS_NODE_JS_VERSION = '8.10';
+const SERVERLESS_NODE_JS_VERSION = '10.17';
 
 export function printVersionWarning(
   nodeVersion: string,