Remove dependency on time in favor of std::time

[serprex]

No description provided.

[rust-highfive]

Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @wycats (or someone else) soon.

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[alexcrichton]

@bors: r+ 6083780

Nice!

[bors]

⌛ Testing commit 6083780 with merge 8bdec5e...

[bors]

☀️ Test successful - cargo-cross-linux, cargo-linux-32, cargo-linux-64, cargo-mac-32, cargo-mac-64, cargo-win-gnu-32, cargo-win-gnu-64, cargo-win-msvc-32, cargo-win-msvc-64