Bump notify, hyper and tokio after stabilization

[razorheadfx]

Currently these deps are tracking pre-release branches because of an issue described in: e7376d9

hyper           = "0.13.0-alpha.4"
tokio-fs        = "0.2.0-alpha.6"
tokio-io        = "0.2.0-alpha.6"
tokio-sync      = "0.2.0-alpha.6"
tokio           = { version = "=0.2.0-alpha.6" }

Once the std::future friendly versions of the deps have dropped, bump them to minor versions.

Also once notify has a stable 5.xrelease bump to major version

[razorheadfx]

Tokio bumped to 1 by #9 & removed the tokio subdependencies as they were merged into the main crate when tokio was refactored.

Looks like notify is still in 5.0.0 pre status 2 years later.