Drop support for node v10

Author: bjornstar

.appveyor.yml

@@ -5,7 +5,6 @@ environment:
     - nodejs_version: '16'
     - nodejs_version: '14'
     - nodejs_version: '12'
-    - nodejs_version: '10'
 
 install:
   - ps: Install-Product node $env:nodejs_version

.github/workflows/nodejs.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [10.x, 12.x, 14.x, 16.x]
+        node-version: [12.x, 14.x, 16.x]
 
     steps:
     - uses: actions/checkout@v2

.travis.yml

@@ -7,5 +7,4 @@ node_js:
   - 16
   - 14
   - 12
-  - 10
 sudo: false

package.json

@@ -24,7 +24,7 @@
   },
   "main": "./lib",
   "engines": {
-    "node": ">=10"
+    "node": ">=12"
   },
   "scripts": {
     "lint": "eslint lib test bin/node-dev",