Upgraded dependencies

[marioortizmanero]

I ran a cargo upgrade from cargo-edit to update the dependencies used in this module. I strongly suggest integrating Dependabot here so that this is taken care of automatically. It's really easy to use and avoids having to update all dependencies at once.

The only change I had to make so that the examples compiled was upgrading percent_encoding to v2.X. I simply followed the instructions indicated on their repo for the encoding set this module used.

On a side note: I think the base64 dependency may be unnecessary. I don't see where it's exactly being used, and the examples still compile after removing it from Cargo.toml and the extern crate from lib.rs.

Edit: please merge #106 first so that I can update this afterwards.

[marioortizmanero]

I've updated this PR after #106 has been merged, @ramsayleung. You can now review this when you have time.

[ramsayleung]

I strongly suggest integrating Dependabot here so that this is taken care of automatically.

Yeah, I would like to take time to figure out how it works, and integrate it later. I just integrate Dependabot with this PR #111 everything is well set.