Update repro for Robust04

[JMMackenzie]

No description provided.

[codecov]

Codecov Report

Merging #960 into master will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master     #960      +/-   ##
============================================
- Coverage     39.37%   39.32%   -0.05%     
+ Complexity      508      506       -2     
============================================
  Files           120      120              
  Lines          7249     7249              
  Branches       1087     1087              
============================================
- Hits           2854     2851       -3     
- Misses         4106     4110       +4     
+ Partials        289      288       -1

Impacted Files	Coverage Δ	Complexity Δ
...java/io/anserini/ltr/feature/CountBigramPairs.java	64.93% <0%> (-5.2%)	23% <0%> (-3%)
...anserini/ltr/feature/base/PMIFeatureExtractor.java	86.53% <0%> (+1.92%)	13% <0%> (+1%)	⬆️

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