Wrong duration: 01:64:55 on the report

[junaruga]

Description of your issue:

NOTE: If you are experiencing a build failure, please include:

I received an email report from Shippable after building CI.
It finished with timeout.
The Duration is 01:64:55 in the report. But it is wrong. "64" is wrong minute.

And seeing the below actual build page, it shows 1h 4m.

• Link to the build failure
  https://app.shippable.com/github/team-gogut/yamp-arm/runs/17/1/console
• Scripts called from the yml (optional)
  https://github.com/junaruga/yamp-arm/blob/40f17b7ed78f114db6d0ebbc9ebf43c00c631b61/shippable.yml

[a-murphy]

Thank you for reporting this.