[DEV] Testing rat tool.

[jorgecarleitao]

This is a test of the RAT tool. It should fail because I just removed a license header.

[codecov-commenter]

Codecov Report

Merging #480 (7703e69) into master (9f56afb) will decrease coverage by 0.00%.
The diff coverage is 98.70%.

❗ Current head 7703e69 differs from pull request most recent head 4824704. Consider uploading reports for the commit 4824704 to get more accurate results

@@            Coverage Diff             @@
##           master     #480      +/-   ##
==========================================
- Coverage   82.65%   82.65%   -0.01%     
==========================================
  Files         165      165              
  Lines       45556    45524      -32     
==========================================
- Hits        37655    37627      -28     
+ Misses       7901     7897       -4     

Impacted Files	Coverage Δ
arrow/src/compute/kernels/aggregate.rs	73.40% <ø> (ø)
parquet/src/encodings/decoding.rs	92.47% <ø> (ø)
parquet/src/arrow/array_reader.rs	77.45% <57.14%> (+0.13%)	⬆️
arrow/src/json/reader.rs	84.02% <97.56%> (+0.11%)	⬆️
arrow/src/array/array_binary.rs	90.13% <100.00%> (ø)
arrow/src/array/array_boolean.rs	90.90% <100.00%> (ø)
arrow/src/array/array_dictionary.rs	84.56% <100.00%> (ø)
arrow/src/array/array_primitive.rs	94.70% <100.00%> (ø)
arrow/src/array/array_struct.rs	87.84% <100.00%> (-0.59%)	⬇️
arrow/src/array/array_union.rs	86.93% <100.00%> (ø)
... and 24 more

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[alamb]

This test failed, but @jorgecarleitao has fixed the underlying issue on #482