Does this issue relate to a new feature or an existing bug?

• Bug
• New Feature

What version of Serilog is affected? Please list the related NuGet package.
N/A

What is the target framework and operating system? See target frameworks & net standard matrix.

• netCore 2.0
• netCore 1.0
• 4.7
• 4.6.x
• 4.5.x

Please describe the current behavior?
The most recent Travis build failed, however the failure status is not recognised by Travis or Github and other tooling. This means the only way to notice the failure is by a human checking inside the build logs.

Please describe the expected behavior?
When any part of the build.sh process fails, the failure should be fatal and reported via a non-zero exit code, so that the tooling understands it failed. I think this is expected because that appears to be how build.ps1 works.