Use .NET Standard 2.0 DLLs when syncing DLLs locally

Author: desplesda

sync-yarnspinner-dlls.sh

@@ -25,7 +25,7 @@ fi
 cd $YARNSPINNER_FOLDER
 dotnet-gitversion /updateAssemblyInfo
 mkdir -p .build-tmp
-dotnet build -p:TargetFramework=netstandard2.1 --configuration Debug -o .build-tmp YarnSpinner.Compiler
+dotnet build -p:TargetFrameworks=netstandard2.0 --configuration Debug -o .build-tmp YarnSpinner.Compiler
 
 # some types we are going to want to use externally but the rest should be fully internal to Yarn Spinner itself
 assemblyalias --target-directory ".build-tmp" --prefix "Yarn." --assemblies-to-alias "Antlr*;Csv*;Google*;"