fix changelog date typo (v6.17.0)

[jmm]

Same typo is also at the top of https://nodejs.org/en/blog/vulnerability/february-2019-security-releases/.

On a side note, I must be misunderstanding something because I'm not seeing how the contributing advice for identifying subsystems touched when writing a commit message would help:

Check the output of git log --oneline files/you/changed to find out what subsystems your changes touch.

That output doesn't seem to help identify changed files / it's actually saying to list changed files as input to the command. I feel like the intention here would be to do something more like?:

git log --name-only master..

But even so not sure how helpful that is in identifying the expected prefix. E.g. the examples given are src, which I assume refers to the top-level src/ directory, and net, which I assume refers to lib/net.js.

[jmm]

Well actually since the ideal time to figure out the prefix is before making the commit, wouldn't just looking at the modified paths with git status be more to the point than anything involving git log?

[vsemozhetbyt]

CI-lite: https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/2995/

[vsemozhetbyt]

Node.js Collaborators, please, add 👍 here if you approve fast-tracking.

[vsemozhetbyt]

Landed in 0622ce6
Thank you!

[jmm]

Thanks @vsemozhetbyt and everyone. Would be interested to understand what the changelog advice about identifying subsystems for commit messages is getting at if someone has a chance to comment.

[vsemozhetbyt]

@jmm If nobody answers here, please, create an issue with the question)