Upgrade idna dependency to 0.1.4 and publish rust-url 1.5.2

[valenting]

We would like to update the dependency in Gecko to get the latest idna table.

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This change is 

[valenting]

@SimonSapin @Manishearth What are the next steps here?

[SimonSapin]

I think you don’t need this to get that, since Cargo considers 0.1.4 to be semver-compatible with 0.1.0. Try running this in Gecko:

(cd toolkit/library/rust && cargo update -p idna)
(cd toolkit/library/gtest/rust && cargo update -p idna)
./mach vendor rust

[valenting]

Oh, I didn't know that. Thanks for the info 😄