build: try to use latest node binary for Travis linter
Refs: https://github.com/nodejs/node/pull/24079#issuecomment-436344611 Refs: https://docs.travis-ci.com/user/languages/javascript-with-nodejs/#specifying-nodejs-versions Refs: http://logs.libuv.org/node-dev/2018-11-06#22:53:21.202
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines