Fix DLL references after lowering to .netstandard2.0

Author: florenzen

docsSrc/index.fsx

@@ -8,10 +8,10 @@ index: 1
 *)
 
 (*** condition: prepare ***)
-#r "../src/JsonSchemaProvider.DesignTime/bin/Debug/netstandard2.1/JsonSchemaProvider.DesignTime.dll"
-#r "../src/JsonSchemaProvider.Runtime/bin/Debug/netstandard2.1/JsonSchemaProvider.Runtime.dll"
-#r "../src/JsonSchemaProvider.Runtime/bin/Debug/netstandard2.1/FSharp.Data.Json.Core.dll"
-#r "../src/JsonSchemaProvider.Runtime/bin/Debug/netstandard2.1/NJsonSchema.dll"
+#r "../src/JsonSchemaProvider.DesignTime/bin/Debug/netstandard2.0/JsonSchemaProvider.DesignTime.dll"
+#r "../src/JsonSchemaProvider.Runtime/bin/Debug/netstandard2.0/JsonSchemaProvider.dll"
+#r "../src/JsonSchemaProvider.Runtime/bin/Debug/netstandard2.0/FSharp.Data.Json.Core.dll"
+#r "../src/JsonSchemaProvider.Runtime/bin/Debug/netstandard2.0/NJsonSchema.dll"
 
 (**
 # Scope