build: try to use latest node binary for Travis linter

[refack]

Refs: #24079 (comment)
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

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• commit message follows commit guidelines

[nodejs-github-bot]

@refack build started: https://ci.nodejs.org/blue/organizations/jenkins/node-test-pull-request-lite-pipeline/detail/node-test-pull-request-lite-pipeline/1521/pipeline

[refack]

Travis output:

$ export PATH=./node_modules/.bin:$PATH
Updating nvm
nvm.install
nvm install node
Downloading and installing node v11.1.0...
Downloading https://nodejs.org/dist/v11.1.0/node-v11.1.0-linux-x64.tar.xz...
Computing checksum with sha256sum
Checksums matched!
Now using node v11.1.0 (npm v6.4.1)
$ node --version
v11.1.0
$ npm --version
6.4.1
$ nvm --version
0.33.11
0.01s$ node -v
v11.1.0
The command "node -v" exited with 0.
$ make lint
make[1]: Entering directory `/home/travis/build/refack/node'
Running JS linter...
make[1]: Leaving directory `/home/travis/build/refack/node'

/CC @nodejs/testing

[cjihrig]

Duplicate of #24198?

[refack]

ack.