Upgrade Node.js to 8.11.3 and Yarn to 1.6.0 #6512
Merged
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Problem
The version of Node.js and Yarnpkg in Pants is outdated by a year. This is duplicating #6341, but has fixes to the Travis CI test failures.
Solution
Upgrade Node.js to v8.11.3 and Yarnpkg to v1.6.0
Result
Node.js is by default v8.11.3 and Yarnpkg to v1.6.0