Check for updateTimeout before checking for unref

[mboperator]

Closes #90

[codecov]

Codecov Report

Merging #91 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #91   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         192    192           
  Branches       48     48           
=====================================
  Hits          192    192

Impacted Files	Coverage Δ
lib/lockfile.js	100% <100%> (ø)	⬆️

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[jessebmiller]

The bug that this PR mitigates, which I understand was not caused by proper-lockfile but can be mitigated here, was very hard and unintuitive to investigate and understand.

Future me would be appreciative not to have to figure it out again.

[hugomrdias]

This is an old PR i'm going to close this! Feel free to reopen if it needs more discussion.
Check #90
Thank you.