Reset testing on nightly
Reset testing on nightly

Perhaps a bug with my version of bindgen? Running `cargo update` seemed
to fix the problem.

mindriot101/rust-fitsio,mindriot101/rust-cfitsio,mindriot101/rust-fitsio,mindriot101/rust-fitsio,mindriot101/rust-cfitsio,mindriot101/rust-fitsio,mindriot101/rust-fitsio