Adds drone.yml file for CI.
Adds drone.yml file for CI.

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