tools: update to ESLint 4.1.1
First ESLint update done with tools/update-eslint.sh. It's a small diff (6 files) because it's a small patch fix release. I don't think the bugs fixed here are likely to affect us, but with new custom rules coming online (such as https://github.com/nodejs/node/pull/13813), I'd rather be up-to-date especially when the diff is small like it is here.
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
tools