[ArduinoJson] Update external library ArduinoJson.

Is needed to compile new ESP32 code.

lib/ArduinoJson/test/JsonArray/basics.cpp

@@ -0,0 +1,29 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("JsonArray basics") {
+  DynamicJsonBuffer jb;
+  JsonArray& array = jb.createArray();
+
+  SECTION("SuccessIsTrue") {
+    REQUIRE(array.success());
+  }
+
+  SECTION("InitialSizeIsZero") {
+    REQUIRE(0U == array.size());
+  }
+
+  SECTION("CreateNestedArray") {
+    JsonArray& arr = array.createNestedArray();
+    REQUIRE(&arr == &array[0].as<JsonArray&>());
+  }
+
+  SECTION("CreateNestedObject") {
+    JsonObject& obj = array.createNestedObject();
+    REQUIRE(&obj == &array[0].as<JsonObject&>());
+  }
+}