Bump minimum Node version

Author: mheap

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x]
+        node-version: [12.x, 14.x, 16.x]
 
     env:
       CI: true

README.md

@@ -2,7 +2,7 @@ trello-cli is a CLI tool for [Trello](http://www.trello.com). Makes sense, right
 
 [![Build Status](https://api.travis-ci.org/mheap/trello-cli.svg?branch=master)](https://travis-ci.org/mheap/trello-cli)
 
-`trello-cli` requires a minimum NodeJS version of 8
+`trello-cli` requires a minimum NodeJS version of 12
 
 # Installation