Update.

.eslintrc

@@ -5,6 +5,9 @@
  es6: true
  node: true
 
+ parserOptions:
+ ecmaVersion: 2019
+
  rules:
  array-bracket-spacing: [2, never]
  arrow-parens: [2, as-needed]

.travis.yml

@@ -0,0 +1,15 @@
+language: node_js
+
+sudo: false
+
+node_js:
+ - node
+ - "12"
+ - "11"
+ - "10"
+ - "9"
+ - "8"
+
+branches:
+ only:
+ - master

README.md

@@ -1,7 +1,7 @@
 # pagemap
 
 [![license][license-img]][github] [![web][web-img]][web] [![github][github-img]][github] [![npm][npm-img]][npm] 
-[![version][npm-v-img]][npm] [![downloads][npm-dm-img]][npm]
+[![version][npm-v-img]][npm] [![downloads][npm-dm-img]][npm] [![build status][travis-img]][travis]
 
 Mini map for web pages.
 
@@ -69,6 +69,7 @@ THE SOFTWARE.
 [web]: https://larsjung.de/pagemap/
 [github]: https://github.com/lrsjng/pagemap
 [npm]: https://www.npmjs.org/package/pagemap
+[travis]: https://travis-ci.org/lrsjng/pagemap
 
 [license-img]: https://img.shields.io/badge/license-MIT-a0a060.svg?style=flat-square
 [web-img]: https://img.shields.io/badge/web-larsjung.de/pagemap-a0a060.svg?style=flat-square
@@ -77,3 +78,4 @@ THE SOFTWARE.
 
 [npm-v-img]: https://img.shields.io/npm/v/pagemap.svg?style=flat-square
 [npm-dm-img]: https://img.shields.io/npm/dm/pagemap.svg?style=flat-square
+[travis-img]: https://img.shields.io/travis/lrsjng/pagemap.svg?style=flat-square