Fix links in RELEASES.md

[WiSaGaN]

No description provided.

[rust-highfive]

r? @aturon

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[pietroalbini]

r? @Mark-Simulacrum

This PR just reorders 1.27 release notes links or removes a few unused ones. I don't think it's critical to get this into beta/stable.

[Mark-Simulacrum]

@bors r+ rollup

[bors]

📌 Commit f8c8701 has been approved by Mark-Simulacrum

[bors]

⌛ Testing commit f8c8701 with merge 01ff7d977dc91e3de975b41c718caa7730c7b682...

[bors]

💔 Test failed - status-travis

[rust-highfive]

The job arm-android of your PR failed on Travis (raw log). 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.

[01:31:58] test time::tests::system_time_elapsed ... ok
[01:31:58] test time::tests::system_time_math ... ok
[01:32:03] test sync::mpsc::tests::stress_recv_timeout_two_threads ... ok
[01:32:05] test collections::hash::map::test_map::test_lots_of_insertions ... ok
[01:32:38] test process::tests::test_process_output_fail_to_start ... test process::tests::test_process_output_fail_to_start has been running for over 60 seconds
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

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. (Feature Requests)

[rust-highfive]

The job arm-android of your PR failed on Travis (raw log). 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.

[01:31:58] test time::tests::system_time_elapsed ... ok
[01:31:58] test time::tests::system_time_math ... ok
[01:32:03] test sync::mpsc::tests::stress_recv_timeout_two_threads ... ok
[01:32:05] test collections::hash::map::test_map::test_lots_of_insertions ... ok
[01:32:38] test process::tests::test_process_output_fail_to_start ... test process::tests::test_process_output_fail_to_start has been running for over 60 seconds
No output has been received in the last 30m0s, this potentially indicates a stalled build or something wrong with the build itself.
Check the details on how to adjust your build configuration on: https://docs.travis-ci.com/user/common-build-problems/#Build-times-out-because-no-output-was-received
The build has been terminated

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. (Feature Requests)

[Mark-Simulacrum]

@bors retry - timeout

[bors]

⌛ Testing commit f8c8701 with merge 90c921e...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: Mark-Simulacrum
Pushing 90c921e to master...