Don't test SMS Spam Collection on CI

[Dsantra92]

Need to fix #163 before the CI tests pass.

[Dsantra92]

Merge #165 before this

[Dsantra92]

@CarloLucibello Merging this with the current master, should resolve current CI problems.

[codecov-commenter]

Codecov Report

Merging #164 (23ac705) into master (64ba34d) will decrease coverage by 0.43%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
- Coverage   32.86%   32.43%   -0.44%     
==========================================
  Files          41       41              
  Lines        2084     2032      -52     
==========================================
- Hits          685      659      -26     
+ Misses       1399     1373      -26     

Impacted Files	Coverage Δ
src/datasets/graphs/movielens.jl	0.74% <ø> (+<0.01%)	:arrow_up:
src/datasets/text/smsspamcollection.jl	7.69% <0.00%> (-44.16%)	:arrow_down:
src/datasets/vision/mnist_reader/readlabels.jl	58.33% <0.00%> (-1.67%)	:arrow_down:
src/datasets/vision/mnist_reader/readimages.jl	55.17% <0.00%> (-1.50%)	:arrow_down:
src/datasets/graphs/ogbdataset.jl	55.96% <0.00%> (-1.32%)	:arrow_down:
src/datasets/text/udenglish.jl	56.00% <0.00%> (-0.87%)	:arrow_down:
src/graph.jl	50.00% <0.00%> (ø)
src/datasets/graphs/planetoid.jl	100.00% <0.00%> (ø)
...rc/datasets/vision/cifar10_reader/CIFAR10Reader.jl	0.00% <0.00%> (ø)
... and 6 more

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