Update asyncronous dependencies

[Kixiron]

• Updated tokio, reqwest, base64 and tiny_http
• Removed tokio-process (Deprecated in favor of the process feature of tokio)
• Replaced futures with futures-util and updated (Less dependencies, the extra features of futures weren't being used)

[jyn514]

If you update base64 to 0.11 it will remove another duplicate dependency:

$ cargo tree -d
base64 v0.10.1
└── rustwide v0.6.1 (/home/joshua/src/rustwide)

base64 v0.11.0
└── reqwest v0.10.4
    └── rustwide v0.6.1 (/home/joshua/src/rustwide)
...

[jyn514]

tiny_http also causes a lot of duplicates, you could try updating it to 0.7. It's only a dev-dependency though.

[jyn514]

Updating to base64 0.12 actually introduced a duplicate, up to you whether you think it's worth fixing or not.

cargo tree -d
base64 v0.11.0
└── reqwest v0.10.4
    └── rustwide v0.6.1 (/home/joshua/src/rustwide)

base64 v0.12.1
└── rustwide v0.6.1 (/home/joshua/src/rustwide)

[pietroalbini]

Thanks!