[ArduinoJson] Update external library ArduinoJson.

Is needed to compile new ESP32 code.

lib/ArduinoJson/test/JsonArray/iterator.cpp

@@ -0,0 +1,38 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+template <typename TIterator>
+static void run_iterator_test() {
+  StaticJsonBuffer<JSON_ARRAY_SIZE(2)> jsonBuffer;
+
+  JsonArray &array = jsonBuffer.createArray();
+  array.add(12);
+  array.add(34);
+
+  TIterator it = array.begin();
+  TIterator end = array.end();
+
+  REQUIRE(end != it);
+  REQUIRE(12 == it->template as<int>());
+  REQUIRE(12 == static_cast<int>(*it));
+  ++it;
+  REQUIRE(end != it);
+  REQUIRE(34 == it->template as<int>());
+  REQUIRE(34 == static_cast<int>(*it));
+  ++it;
+  REQUIRE(end == it);
+}
+
+TEST_CASE("JsonArray::begin()/end()") {
+  SECTION("Mutable") {
+    run_iterator_test<JsonArray::iterator>();
+  }
+
+  SECTION("Const") {
+    run_iterator_test<JsonArray::const_iterator>();
+  }
+}