[ArduinoJson] Update external library ArduinoJson.

Is needed to compile new ESP32 code.

lib/ArduinoJson/test/DynamicJsonBuffer/createArray.cpp

@@ -0,0 +1,28 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#include <ArduinoJson.h>
+#include <catch.hpp>
+
+TEST_CASE("DynamicJsonBuffer::createArray()") {
+  DynamicJsonBuffer jsonBuffer;
+  JsonArray &array = jsonBuffer.createArray();
+
+  SECTION("GrowsWithArray") {
+    REQUIRE(JSON_ARRAY_SIZE(0) == jsonBuffer.size());
+
+    array.add("hello");
+    REQUIRE(JSON_ARRAY_SIZE(1) == jsonBuffer.size());
+
+    array.add("world");
+    REQUIRE(JSON_ARRAY_SIZE(2) == jsonBuffer.size());
+  }
+
+  SECTION("CanAdd1000Values") {
+    for (size_t i = 1; i <= 1000; i++) {
+      array.add("hello");
+      REQUIRE(array.size() == i);
+    }
+  }
+}