Add SciML style formatter to MLDatasets.jl

[Dsantra92]

Closes #202

[CarloLucibello]

I don't expect any surprises, but can you also run the tests locally?

[Dsantra92]

I will run the tests at the end of the day.

[codecov-commenter]

Codecov Report

Merging #205 (3d1e300) into master (42e6f5e) will increase coverage by 0.07%.
The diff coverage is 47.03%.

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@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
+ Coverage   48.94%   49.02%   +0.07%     
==========================================
  Files          45       45              
  Lines        2278     2299      +21     
==========================================
+ Hits         1115     1127      +12     
- Misses       1163     1172       +9     

Impacted Files	Coverage Δ
src/MLDatasets.jl	100.00% <ø> (ø)
src/containers/hdf5dataset.jl	0.00% <0.00%> (ø)
src/containers/jld2dataset.jl	0.00% <0.00%> (ø)
src/containers/tabledataset.jl	0.00% <ø> (ø)
src/datasets/graphs/organicmaterialsdb.jl	9.25% <0.00%> (ø)
.../datasets/vision/cifar100_reader/CIFAR100Reader.jl	0.00% <0.00%> (ø)
...rc/datasets/vision/cifar10_reader/CIFAR10Reader.jl	0.00% <0.00%> (ø)
src/datasets/vision/mnist_reader/MNISTReader.jl	100.00% <ø> (ø)
src/download.jl	41.93% <0.00%> (ø)
src/require.jl	53.12% <0.00%> (-0.85%)	⬇️
... and 42 more

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[Dsantra92]

@CarloLucibello I tested the non-manual datasets. They passed without errors.