#78 Update link to DALEX repository

[codecov-io]

Codecov Report

Merging #80 into master will increase coverage by 3.8%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master      #80     +/-   ##
=========================================
+ Coverage   89.22%   93.03%   +3.8%     
=========================================
  Files           1        1             
  Lines         232      330     +98     
=========================================
+ Hits          207      307    +100     
+ Misses         25       23      -2

Impacted Files	Coverage Δ
R/modelDown.R	93.03% <0%> (+3.8%)	:arrow_up:

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[pbiecek]

Thanks