message: white_check_mark: more tests for meta() call
diff: @@ -33,10 +33,14 @@ using nlohmann::json;
  TEST_CASE("version information")
  {
  - SECTION("version()")
  + SECTION("meta()")
  {
  - CHECK(json::meta()["name"] == "JSON for Modern C++");
  - CHECK(json::meta()["version"] == json(
  + json j = json::meta();
  +
  + CHECK(j["name"] == "JSON for Modern C++");
  + CHECK(j["copyright"] == "(C) 2013-2017 Niels Lohmann");
  + CHECK(j["url"] == "https://github.com/nlohmann/json");
  + CHECK(j["version"] == json(
  {
  {"string", "2.1.1"},
  {"major", 2},
  