Branch on Julia version to avoid qr deprecation warning

[andreasnoack]

The old qr invocation will give deprecation warning on Julia 1.7.

[codecov-commenter]

Codecov Report

Merging #50 (ad8c5a3) into master (a4ae2f0) will increase coverage by 0.92%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #50      +/-   ##
==========================================
+ Coverage   91.66%   92.59%   +0.92%     
==========================================
  Files           2        2              
  Lines         168      189      +21     
==========================================
+ Hits          154      175      +21     
  Misses         14       14              

Impacted Files	Coverage Δ
src/Loess.jl	87.37% <100.00%> (+0.71%)	⬆️
src/kd.jl	98.83% <0.00%> (+1.40%)	⬆️

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