Updates content-type to x-amz-json-1.1.
Updates content-type to x-amz-json-1.1.

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