Updated indexes for CORD-19 2020/04/10 release

[lintool]

Sanity checked and ready to go.

[codecov]

Codecov Report

Merging #1090 into master will increase coverage by 0.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1090      +/-   ##
============================================
+ Coverage     44.66%   44.88%   +0.21%     
- Complexity      659      668       +9     
============================================
  Files           141      141              
  Lines          8184     8184              
  Branches       1166     1166              
============================================
+ Hits           3655     3673      +18     
+ Misses         4201     4182      -19     
- Partials        328      329       +1     

Impacted Files	Coverage Δ	Complexity Δ
...anserini/ltr/feature/base/PMIFeatureExtractor.java	84.61% <0.00%> (-1.93%)	12.00% <0.00%> (-1.00%)
...java/io/anserini/ltr/feature/CountBigramPairs.java	89.61% <0.00%> (+24.67%)	33.00% <0.00%> (+10.00%)

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