adjust versions in rusoto/core readme
adjust versions in rusoto/core readme

rusoto/rusoto,DualSpark/rust-aws,DualSpark/rusoto,mattico/rusoto,mattico/rusoto,rusoto/rusoto,DualSpark/rusoto,SecurityInsanity/rusoto,DualSpark/rust-aws,rusoto/rusoto,SecurityInsanity/rusoto,DualSpark/rust-aws,mattico/rusoto,DualSpark/rusoto