Revert "Merge branch 'master' of https://github.com/1technophile/OpenMQTTGateway"

This reverts commit a70c33a68e, reversing
changes made to f515f9c03a.

lib/ArduinoJson/test/Misc/StringTraits.cpp

@@ -1,22 +0,0 @@
-// ArduinoJson - arduinojson.org
-// Copyright Benoit Blanchon 2014-2018
-// MIT License
-
-#include <ArduinoJson.h>
-#include <catch.hpp>
-
-using namespace ArduinoJson::Internals;
-
-template <typename String>
-bool should_duplicate() {
-  return StringTraits<String>::should_duplicate;
-}
-
-TEST_CASE("StringTraits") {
-  SECTION("should_duplicate") {
-    REQUIRE(false == should_duplicate<const char*>());
-    REQUIRE(true == should_duplicate<char*>());
-    REQUIRE(true == should_duplicate<RawJsonString<char*> >());
-    REQUIRE(false == should_duplicate<RawJsonString<const char*> >());
-  }
-}