Switches S3 provider in example main to use provider chain.
Switches S3 provider in example main to use provider chain.

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