[JS] JavaScript builds broken on master

[asfimport]

see https://travis-ci.org/apache/arrow/jobs/322059486

Reporter: Wes McKinney / @wesm
Assignee: Paul Taylor / @trxcllnt

PRs and other links:

• GitHub Pull Request #1453

_{Note: This issue was originally created as ARROW-1953. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
[~paul.e.taylor] could you take a look? Thanks!

[asfimport]

Paul Taylor / @trxcllnt:
oh yeah, last week our build tool committed a silent breaking change w/o respecting semver. will PR a fix shortly

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 1453
#1453