Notable changes:
* streams: Fix a regression introduced in v6.8.0 in readable stream
that caused unpipe to remove the wrong stream (Anna Henningsen)
PR-URL: https://github.com/nodejs/node/pull/9186
* [[`6072326009`](https://github.com/nodejs/node/commit/6072326009)] - **test**: add regression test for `unpipe()` (Niels Nielsen) [#9171](https://github.com/nodejs/node/pull/9171)
* [[`9f248a4d83`](https://github.com/nodejs/node/commit/9f248a4d83)] - **tools**: check tag is on github before release (Rod Vagg) [#9142](https://github.com/nodejs/node/pull/9142)
* [[`c74d3a700a`](https://github.com/nodejs/node/commit/c74d3a700a)] - **tools**: make detached SHASUM .sig file for releases (Rod Vagg) [#9071](https://github.com/nodejs/node/pull/9071)
* [[`955bbf876f`](https://github.com/nodejs/node/commit/955bbf876f)] - **tools**: explicitly set digest algo for SHASUM to 256 (Rod Vagg) [#9071](https://github.com/nodejs/node/pull/9071)
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## 2016-10-18, Version 6.9.0 'Boron' (LTS), @rvagg
## 2016-10-18, Version 6.9.0 'Boron' (LTS), @rvagg