Unbreak build

[henrydavidge]

What changes are proposed in this pull request?

#59 broke master because CircleCI tests only the PR branch, not the PR branch + master.

I'll work on a followup that merges master into the PR branch as a CI step.

How is this patch tested?

• Unit tests
• Integration tests
• Manual tests

(Details)

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@b099251). Click here to learn what that means.
The diff coverage is 100%.

@@            Coverage Diff            @@
##             master      #63   +/-   ##
=========================================
  Coverage          ?   94.11%           
=========================================
  Files             ?       74           
  Lines             ?     3569           
  Branches          ?      331           
=========================================
  Hits              ?     3359           
  Misses            ?      210           
  Partials          ?        0

Impacted Files	Coverage Δ
...n/scala/io/projectglow/plink/PlinkFileFormat.scala	100% <100%> (ø)

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