tools: update ESLint to 5.2.0
changelog: https://github.com/eslint/eslint/releases/tag/v5.1.0 https://github.com/eslint/eslint/releases/tag/v5.2.0
CI: https://ci.nodejs.org/job/node-test-pull-request/15882/
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines