Update winston to version 2.3.1 🚀

[greenkeeperio-bot]

Hello lovely humans,

winston just published its new version 2.3.1.

State	Update 🚀
Dependency	winston
New version	2.3.1
Type	dependency

This version is not covered by your current version range.

Without accepting this pull request your project will work just like it did before. There might be a bunch of new features, fixes and perf improvements that the maintainers worked on for you though.

I recommend you look into these changes and try to get onto the latest version of winston.
Given that you have a decent test suite, a passing build is a strong indicator that you can take advantage of these changes by merging the proposed change into your project. Otherwise this branch is a great starting point for you to work on the update.

Do you have any ideas how I could improve these pull requests? Did I report anything you think isn’t right?
Are you unsure about how things are supposed to work?

There is a collection of frequently asked questions and while I’m just a bot, there is a group of people who are happy to teach me new things. Let them know.

Good luck with your project ✨

You rock!

🌴

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The new version differs by 38 commits .

• fba37b4 [dist] Version bump. 2.3.1
• 21980ac Merge pull request #868 from veger/fix_max_call_size_error
• 01cf7ce Fix 'Maximum call stack size exceeded' error with custom formatter (Issue #862)
• 739d802 [dist] Version bump. 2.3.0
• 26664f4 [dist] Modernize .travis.yml again
• d9050b8 [dist] Add short message for 2.2.0 until a full CHANGELOG.md entry can be compiled.
• c98e6c5 Merge pull request #839 from vanthome/patch-1
• 0198c17 Merge pull request #852 from tamlyn/master
• c351649 Merge pull request #858 from tarrow/patch-1
• 55dac6d Merge pull request #859 from davidadas/master
• ab926c3 Merge pull request #882 from khowen/update-docs
• 1dedee5 Merge pull request #894 from pkallos/master
• 162c50f Merge pull request #898 from sinkingpoint/master
• 391a956 fix: use es5 only
• 98fd982 Update transports.js

There are 38 commits in total. See the full diff.

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