fix(kernelcpd): add early check on segmentation parameters

[oboulant]

closes #123

[codecov]

Codecov Report

Merging #128 (afa2709) into master (743eb5d) will increase coverage by 0.88%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
+ Coverage   95.12%   96.01%   +0.88%     
==========================================
  Files          41       40       -1     
  Lines         965      979      +14     
==========================================
+ Hits          918      940      +22     
+ Misses         47       39       -8     

Impacted Files	Coverage Δ
src/ruptures/utils/utils.py	80.95% <ø> (ø)
src/ruptures/costs/costrank.py	93.33% <100.00%> (+0.22%)	⬆️
src/ruptures/detection/binseg.py	100.00% <100.00%> (ø)
src/ruptures/detection/bottomup.py	100.00% <100.00%> (ø)
src/ruptures/detection/dynp.py	100.00% <100.00%> (ø)
src/ruptures/detection/kernelcpd.py	100.00% <100.00%> (ø)
src/ruptures/detection/pelt.py	100.00% <100.00%> (ø)
src/ruptures/detection/window.py	100.00% <100.00%> (ø)
src/ruptures/exceptions.py	100.00% <100.00%> (ø)

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