chore: require Node.js >=10.13

BREAKING CHANGE: Require Node.js => 10.13

.travis.yml

@@ -2,8 +2,7 @@ language: node_js
 
 node_js:
   - 12
-  - 10
-  - 8
+  - 10.13
 
 os:
   - linux

package.json

@@ -43,7 +43,7 @@
     "xo": "^0.25.3"
   },
   "engines": {
-    "node": ">=8.16"
+    "node": ">=10.13"
   },
   "files": [
     "index.js",

test/sourcemap.test.js

@@ -8,6 +8,8 @@ import cli from './helpers/cli';
 import read from './helpers/read';
 import eol from './helpers/eol';
 
+/* eslint prefer-named-capture-group: "off" */
+
 test('--map generate an external map (css)', async t => {
 	const output = tempy.file({extension: 'css'});
 	const {error, stderr} = await cli(['test/fixtures/a.css', 'test/fixtures/b.css', '-m', '-o', output]);