change to npm test

1 job for 3-add-gitlab-ci-support in 10 seconds
Name Stage Failure
test_async Test There is an unknown failure, please try again
npm info test ical-generator@0.2.9

> ical-generator@0.2.9 test /builds/srct/lib-ical
> grunt && istanbul cover _mocha -- -R spec --no-colors

sh: 1: grunt: not found
npm info ical-generator@0.2.9 Failed to exec test script
npm ERR! Test failed. See above for more details.
ERROR: Build failed: exit code 1