Upgrade devDependencies and drop Node 8 support

.travis.yml

@@ -1,6 +1,5 @@
 language: node_js
 node_js:
-  - '8'
   - '10'
   - '12'
 cache:

appveyor.yml

@@ -4,7 +4,6 @@ clone_depth: 10
 
 environment:
   matrix:
-    - nodejs_version: 8
     - nodejs_version: 10
     - nodejs_version: 12
 

package.json

@@ -18,24 +18,24 @@
     "test": "eslint \"**/*.js\" && ava"
   },
   "engines": {
-    "node": ">=8"
+    "node": ">=10"
   },
   "dependencies": {
     "mocha": "^6.0.0"
   },
   "devDependencies": {
-    "ava": "^2.4.0",
+    "ava": "^3.5.0",
     "eslint": "^6.5.1",
     "eslint-config-prettier": "^6.4.0",
-    "eslint-config-xo": "^0.27.2",
-    "execa": "^3.2.0",
+    "eslint-config-xo": "^0.29.1",
+    "execa": "^4.0.0",
     "grunt": "^1.0.1",
-    "husky": "^3.0.9",
-    "lint-staged": "^9.4.2",
+    "husky": "^4.2.3",
+    "lint-staged": "^10.0.8",
     "mz": "^2.7.0",
     "prettier": "^1.9.1",
     "should": "^13.1.3",
-    "tempy": "^0.3.0"
+    "tempy": "^0.5.0"
   },
   "husky": {
     "hooks": {
@@ -51,24 +51,17 @@
       "node": true
     }
   },
-  "ava": {
-    "helpers": [
-      "**/fixtures/**/*"
-    ]
-  },
   "prettier": {
     "semi": false,
     "singleQuote": true
   },
   "lint-staged": {
     "*.js": [
       "eslint --fix",
-      "prettier --write",
-      "git add"
+      "prettier --write"
     ],
     "*.{json,md}": [
-      "prettier --write",
-      "git add"
+      "prettier --write"
     ]
   }
 }

test/lib.js

@@ -1,8 +1,8 @@
-import path from 'path'
-import fs from 'mz/fs'
-import test from 'ava'
-import tempy from 'tempy'
-import mocha from '../lib'
+const path = require('path')
+const fs = require('mz/fs')
+const test = require('ava')
+const tempy = require('tempy')
+const mocha = require('../lib')
 
 function getFixturePath(filename) {
   return path.resolve(__dirname, 'fixtures', filename)

test/task.js

@@ -1,6 +1,6 @@
-import path from 'path'
-import test from 'ava'
-import execa from 'execa'
+const path = require('path')
+const test = require('ava')
+const execa = require('execa')
 
 const gruntPath = path.resolve(__dirname, '../node_modules/.bin/grunt')