bump credential version to 0.5.0
bump credential version to 0.5.0

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