git commit fails

Travis build job: https://travis-ci.org/cloudfoundry-incubator/cf-abacus/jobs/457640911
PR: https://github.com/cloudfoundry-incubator/cf-abacus/pull/1118

I can see at least two suspicious lines:
```
...
/bin/sh: 1: npm5: not found
...
 Error: Command failed: git commit -m "chore(package): update lockfile
```