Added JsonVariant::operator| to return a default value

src/ArduinoJson/JsonVariantBase.hpp

@@ -6,6 +6,7 @@
 
 #include "JsonVariantCasts.hpp"
 #include "JsonVariantComparisons.hpp"
+#include "JsonVariantOr.hpp"
 #include "JsonVariantSubscripts.hpp"
 #include "Serialization/JsonPrintable.hpp"
 
@@ -15,6 +16,7 @@ template <typename TImpl>
 class JsonVariantBase : public Internals::JsonPrintable<TImpl>,
                         public JsonVariantCasts<TImpl>,
                         public JsonVariantComparisons<TImpl>,
+                        public JsonVariantOr<TImpl>,
                         public JsonVariantSubscripts<TImpl>,
                         public TypeTraits::JsonVariantTag {};
 }