[Bug] Fix uap10 build in appveyor

[StefH]

No description provided.

[codecov]

Codecov Report

Merging #93 into master will increase coverage by 0.28%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #93      +/-   ##
=========================================
+ Coverage   84.12%   84.4%   +0.28%     
=========================================
  Files          26      26              
  Lines        3162    3162              
  Branches      473     473              
=========================================
+ Hits         2660    2669       +9     
  Misses        362     362              
+ Partials      140     131       -9

Impacted Files	Coverage Δ
src/System.Linq.Dynamic.Core/ExpressionParser.cs	82.85% <0%> (+0.31%)	⬆️
...c/System.Linq.Dynamic.Core/Tokenizer/TextParser.cs	98.61% <0%> (+1.38%)	⬆️

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