chore(package): update xo to version 0.21.0

Author: greenkeeper[bot]

index.js

@@ -11,12 +11,14 @@ const DEFAULT_RELEASE_RULES = require('./lib/default-release-rules');
  * Determine the type of release to create based on a list of commits.
  *
  * @param {Object} [pluginConfig={}] semantic-release configuration
- * @param {string} pluginConfig.preset conventional-changelog preset ('angular', 'atom', 'codemirror', 'ember', 'eslint', 'express', 'jquery', 'jscs', 'jshint')
- * @param {string} pluginConfig.config requierable npm package with a custom conventional-changelog preset
- * @param {string|Array} pluginConfig.releaseRules a string to load an external module or an `Array` of rules.
+ * @param {String} pluginConfig.preset conventional-changelog preset ('angular', 'atom', 'codemirror', 'ember', 'eslint', 'express', 'jquery', 'jscs', 'jshint')
+ * @param {String} pluginConfig.config requierable npm package with a custom conventional-changelog preset
+ * @param {String|Array} pluginConfig.releaseRules a string to load an external module or an `Array` of rules.
  * @param {Object} pluginConfig.parserOpts additional `conventional-changelog-parser` options that will overwrite ones loaded by `preset` or `config`.
  * @param {Object} options semantic-release options
  * @param {Array} options.commits array of commits
+ *
+ * @returns {String|null} the type of release to create based on the list of commits or `null` if no release has to be done.
  */
 async function commitAnalyzer(pluginConfig, {commits, logger}) {
   const releaseRules = loadReleaseRules(pluginConfig);

package.json

@@ -36,7 +36,7 @@
     "rimraf": "^2.6.1",
     "semantic-release": "^15.0.0",
     "sinon": "^5.0.0",
-    "xo": "^0.20.0"
+    "xo": "^0.21.0"
   },
   "engines": {
     "node": ">=8.3"
@@ -71,7 +71,8 @@
     "all": true
   },
   "prettier": {
-    "printWidth": 120
+    "printWidth": 120,
+    "trailingComma": "es5"
   },
   "publishConfig": {
     "access": "public",

test/load-parser-config.test.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import loadParserConfig from './../lib/load-parser-config';
+import loadParserConfig from '../lib/load-parser-config';
 
 /**
  * AVA macro to verify that `loadParserConfig` return a parserOpts object.

test/load-release-rules.test.js

@@ -1,5 +1,5 @@
 import test from 'ava';
-import loadReleaseRules from './../lib/load-release-rules';
+import loadReleaseRules from '../lib/load-release-rules';
 import testReleaseRules from './fixtures/release-rules';
 
 test('Accept a "releaseRules" option', t => {