Bump to 1.27.0

[alexcrichton]

Also update some Cargo.lock dependencies, finishing up some final steps of our
release process!

This doesn't update the bootstrap compiler just yet but that will come in a
follow-up PR.

[alexcrichton]

r? @Mark-Simulacrum

[Mark-Simulacrum]

@bors r+ p=1

[bors]

📌 Commit 5d0a7dc has been approved by Mark-Simulacrum

[TimNN]

Your PR failed on Travis. Through arcane magic we have determined that the following fragments from the build log may contain information about the problem.

Click to expand the log.

[00:00:58] configure: rust.quiet-tests     := True
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[00:48:10] .....................................................................................test [run-pass] run-pass/mir_heavy_promoted.rs has been running for over 60 seconds
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[00:50:09] ..........................i....................................................i.ii.......test [run-pass] run-pass/saturating-float-casts.rs has been running for over 60 seconds
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[01:23:54] cargo/print.html:2017: broken link fragment `#-sys-packages` pointing to `cargo/print.html`
[01:23:54] cargo/reference/build-scripts.html:290: broken link fragment `#-sys-packages` pointing to `cargo/reference/build-scripts.html`
[01:24:07] rustdoc/passes.html:142: broken link fragment `#--passes-add-more-rustdoc-passes` pointing to `rustdoc/command-line-arguments.html`
[01:24:07] rustdoc/passes.html:143: broken link fragment `#--no-defaults-dont-run-default-passes` pointing to `rustdoc/command-line-arguments.html`
[01:24:07] rustdoc/print.html:788: broken link fragment `#--passes-add-more-rustdoc-passes` pointing to `rustdoc/command-line-arguments.html`
[01:24:07] rustdoc/print.html:789: broken link fragment `#--no-defaults-dont-run-default-passes` pointing to `rustdoc/command-line-arguments.html`
[01:24:09] thread 'main' panicked at 'found some broken links', tools/linkchecker/main.rs:49:9
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[01:24:09] Makefile:58: recipe for target 'check' failed
[01:24:09] make: *** [check] Error 1
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$ find $HOME/Library/Logs/DiagnosticReports -type f -name '*.crash' -not -name '*.stage2-*.crash' -not -name 'com.apple.CoreSimulator.CoreSimulatorService-*.crash' -exec printf travis_fold":start:crashlog\n\033[31;1m%s\033[0m\n" {} \; -exec head -750 {} \; -exec echo travis_fold":"end:crashlog \; || true
find: `/home/travis/Library/Logs/DiagnosticReports': No such file or directory
travis_time:end:1fbe56a8:start=1522689183236473843,finish=1522689183244230312,duration=7756469
travis_fold:end:after_failure.5
travis_fold:start:after_failure.6
travis_time:start:2d81430f
$ dmesg | grep -i kill
[   10.442310] init: failsafe main process (1092) killed by TERM signal

I'm a bot! I can only do what humans tell me to, so if this was not helpful or you have suggestions for improvements, please ping or otherwise contact @TimNN.

[Mark-Simulacrum]

@bors r-

[alexcrichton]

@bors: r=Mark-Simulacrum

[bors]

📌 Commit e9d8983 has been approved by Mark-Simulacrum

[bors]

⌛ Testing commit e9d8983 with merge 5ee891c...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: Mark-Simulacrum
Pushing 5ee891c to master...