Fix broken link, make http links https

[tmielika]

automl.org currently is missing http(s):// in front of it, and there were a couple of http:// links that could as well be https://.

[codecov]

Codecov Report

Merging #1201 (feef435) into master (3d53cd9) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1201      +/-   ##
==========================================
+ Coverage   88.11%   88.14%   +0.02%     
==========================================
  Files         138      138              
  Lines       10866    10866              
==========================================
+ Hits         9575     9578       +3     
+ Misses       1291     1288       -3     

Impacted Files	Coverage Δ
...ature_preprocessing/select_rates_classification.py	85.91% <0.00%> (-1.41%)	⬇️
...learn/pipeline/components/regression/libsvm_svr.py	90.24% <0.00%> (-1.22%)	⬇️
autosklearn/ensemble_builder.py	86.26% <0.00%> (+0.40%)	⬆️
autosklearn/evaluation/abstract_evaluator.py	92.91% <0.00%> (+0.78%)	⬆️
...ine/components/classification/gradient_boosting.py	93.91% <0.00%> (+0.86%)	⬆️

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[eddiebergman]

Hey @tmielika,

Very much appreciated, thank you! :)