travis: test with stable and beta, but not nightly #35
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It's probably a good thing if the spaceapi builds with the latest stable
toolchain, not only with beta / nightly.
Also I removed nightly because recently we hit a compiler bug: https://travis-ci.org/coredump-ch/spaceapi/builds/69862138, see rust-lang/rust#26807 which fixed the error.
But maybe that's a good thing, so we uncover bugs in rustc.