[do not merge] Fixing the Travis build

[korken89]

The travis build is failing on nightly, probably the old cortex-m dependency that's the issue.

[korken89]

1. It seems to be that the overflowing examples fail (as they should) but the ! does not make the fail a pass in the script. Does anyone know why this is happening?
2. The final error is referring to rust-lld: error while loading shared libraries: libLLVM-7.so: cannot open shared object file: No such file or directory, but I am unable to replicate this on my local machine. Any ideas?

cc @rust-embedded/cortex-m

[japaric]

(2) is due to rust-lang/rust#53813. It will be fixed in tomorrow's nightly. The workaround is to install the llvm-tools-preview component or to roll back to a 2-days old nightly.

[korken89]

Thanks for the clarification!

[japaric]

Restarted the CI build and it passed so I'm going to close this.

[korken89]

Thanks @japaric !