Don't build RMS example on CI on Rust 1.4.0
Don't build RMS example on CI on Rust 1.4.0

It requires a later version of Rust. Fortunately it is an example and
not in the core library, so this does not have to be a breaking change.
It would be a good idea to remove this on the next major release though.

ruuda/hound,ruud-v-a/hound