Bug #10, extend `gitlab-ci` YAML; add badge to README [iet:8994834]

5 jobs for 3.x in 3 minutes and 26 seconds (queued for 1 second)
Status Job ID Name Coverage
  Install
passed #65739859
install 1

00:01:22

 
  Build
passed #65739860
build 1

00:01:01

 
  Test
failed #65739862
test 1

00:01:02

 
  Pa11y Ci
skipped #65739863
accessibility test 1
 
  Release
skipped #65739864
release 1
 
Name Stage Failure
failed
test 1 Test
$ npm test

> gaad-widget@3.2.0 test /builds/nfreear/gaad-widget
> semistandard && csslint style

sh: 1: semistandard: not found
npm ERR! Test failed. See above for more details.
npm WARN Local package.json exists, but node_modules missing, did you mean to install?
ERROR: Job failed: exit code 1