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Update dependencies

Created by: ascjones

Running cargo outdated on the ink! codebase yields that mainly ink! CLI is using some outdated dependencies.

cargo-contract
================
Name              Project  Compat  Latest  Kind    Platform
----              -------  ------  ------  ----    --------
futures           0.1.29   ---     0.3.1   Normal  ---
idna              0.1.5    ---     0.2.0   Normal  ---
percent-encoding  1.0.1    ---     2.1.0   Normal  ---
url               1.7.2    ---     2.1.0   Normal  ---

We could update futures to 0.3.1 and by this introduce the new async and await stuff from stable Rust. We should generally just update the others if simple enough.

rel: https://github.com/paritytech/substrate-subxt/issues/36