Travis CI failed because of `/bin/sh: 1: npm5: not found`

[sotayamashita]

Travis CI failed because of /bin/sh: 1: npm5: not found Any idea? Thanks in advance :bow:

• References:
  • TravisCI Log: https://travis-ci.com/pr-triage/app/builds/80299554
  • TravisCI .travis.yml: https://github.com/pr-triage/app/blob/master/.travis.yml
  • Pull Request: https://github.com/pr-triage/app/pull/85