Update gulp-imagemin to version 3.1.1 🚀

[greenkeeperio-bot]

Hello lovely humans,

gulp-imagemin just published its new version 3.1.1.

State	Update 🚀
Dependency	gulp-imagemin
New version	3.1.1
Type	devDependency

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 gulp-imagemin.
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!

🌴

---

The new version differs by 50 commits .

• 8bc8f11 3.1.1
• 696b6ac Pass options to exposed plugins (#231)
• ccee73a 3.1.0
• 20a0255 minor tweaks
• 6e0180c Catch optional dependencies (#227)
• 37f7696 add XO badge
• cb12e33 3.0.3
• e2ac3ea minor readme tweaks
• 70992b4 trying out something new
• 04f5475 3.0.2
• 93534f0 prevent stream unhandled exception from being suppressed by Promise (#199)
• d933de1 3.0.1
• bf8d842 Use imagemin-jpegtran instead of imagemin-mozjpeg
• c841ac6 readme improvements
• aab4324 Remove default options already defined in plugins

There are 50 commits in total. See the full diff.

---

This pull request was created by greenkeeper.io.

_{Tired of seeing this sponsor message? ⚡ greenkeeper upgrade}