Fix BOOST_ROOT variable CMake warning

[otorreno]

No description provided.

[dcuestam]

Great catch!

[codecov]

Codecov Report

Merging #21 into master will increase coverage by 0.15%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master      #21      +/-   ##
============================================
+ Coverage     92.39%   92.54%   +0.15%     
  Complexity      229      229              
============================================
  Files            14       14              
  Lines           644      644              
  Branches         39       39              
============================================
+ Hits            595      596       +1     
+ Misses           31       30       -1     
  Partials         18       18

Flag	Coverage Δ	Complexity Δ
#Linux	92.23% <ø> (ø)	229 <ø> (ø)	⬇️
#MacOS	92.23% <ø> (?)	229 <ø> (?)
#Windows	92.23% <ø> (ø)	229 <ø> (ø)	⬇️

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/io/shapelets/khiva/Library.java	77.14% <0%> (+2.85%)	11% <0%> (ø)	⬇️

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