Tries setting appveyor's rustc version to one that's not hilariously slow.
Tries setting appveyor's rustc version to one that's not hilariously slow.

ford-prefect/rusoto,DualSpark/rust-aws,cmsd2/rusoto,ford-prefect/rusoto,DualSpark/rust-aws,DualSpark/rusoto,mattico/rusoto,noggleboggle/rusoto,DualSpark/rust-aws,rusoto/rusoto,mthjones/rusoto,indiv0/rusoto,mthjones/rusoto,mattico/rusoto,DualSpark/rusoto,DualSpark/rusoto,rusoto/rusoto,SecurityInsanity/rusoto,SecurityInsanity/rusoto,mattico/rusoto,rusoto/rusoto