chore(package): update ava to version 3.1.0

Author: greenkeeper[bot]

package.json

@@ -3,6 +3,11 @@
   "description": "semantic-release plugin to create or update a changelog file",
   "version": "0.0.0-development",
   "author": "Pierre Vanduynslager (https://github.com/pvdlg)",
+  "ava": {
+    "files": [
+      "test/**/*.test.js"
+    ]
+  },
   "bugs": {
     "url": "https://github.com/semantic-release/changelog/issues"
   },
@@ -17,7 +22,7 @@
     "lodash": "^4.17.4"
   },
   "devDependencies": {
-    "ava": "^2.0.0",
+    "ava": "^3.1.0",
     "clear-module": "^4.0.0",
     "codecov": "^3.0.0",
     "nyc": "^15.0.0",

test/integration.test.js

@@ -1,9 +1,9 @@
-import path from 'path';
-import test from 'ava';
-import {outputFile, readFile} from 'fs-extra';
-import {stub} from 'sinon';
-import clearModule from 'clear-module';
-import tempy from 'tempy';
+const path = require('path');
+const test = require('ava');
+const {outputFile, readFile} = require('fs-extra');
+const {stub} = require('sinon');
+const clearModule = require('clear-module');
+const tempy = require('tempy');
 
 test.beforeEach(t => {
   // Clear npm cache to refresh the module state

test/prepare.test.js

@@ -1,9 +1,9 @@
-import path from 'path';
-import test from 'ava';
-import {outputFile, readFile} from 'fs-extra';
-import {stub} from 'sinon';
-import tempy from 'tempy';
-import prepare from '../lib/prepare';
+const path = require('path');
+const test = require('ava');
+const {outputFile, readFile} = require('fs-extra');
+const {stub} = require('sinon');
+const tempy = require('tempy');
+const prepare = require('../lib/prepare');
 
 test.beforeEach(t => {
   // Stub the logger

test/verify.test.js

@@ -1,5 +1,5 @@
-import test from 'ava';
-import verify from '../lib/verify';
+const test = require('ava');
+const verify = require('../lib/verify');
 
 test('Verify String "changelogFile" and "chagngelogTitle"', t => {
   const changelogFile = 'docs/changelog.txt';