Using the homebrew/core Formula

I've submitted a PR on [homebrew/core](https://github.com/Homebrew/homebrew-core/pull/83479) that updates their Formula. After that one is set, we can merge this and let users use the default formula, and we don't have to maintain two separate Formulas.

README.md

@@ -1238,7 +1238,7 @@ endif()
 
 ### Package Managers
 
-:beer: If you are using OS X and [Homebrew](https://brew.sh), just type `brew tap nlohmann/json` and `brew install nlohmann/json/nlohmann_json` and you're set. If you want the bleeding edge rather than the latest release, use `brew install nlohmann/json/nlohmann_json --HEAD`.
+:beer: If you are using OS X and [Homebrew](https://brew.sh), just type `brew install nlohmann-json` and you're set. If you want the bleeding edge rather than the latest release, use `brew install nlohmann-json --HEAD`.
 
 If you are using the [Meson Build System](https://mesonbuild.com), add this source tree as a [meson subproject](https://mesonbuild.com/Subprojects.html#using-a-subproject). You may also use the `include.zip` published in this project's [Releases](https://github.com/nlohmann/json/releases) to reduce the size of the vendored source tree. Alternatively, you can get a wrap file by downloading it from [Meson WrapDB](https://wrapdb.mesonbuild.com/nlohmann_json), or simply use `meson wrap install nlohmann_json`. Please see the meson project for any issues regarding the packaging.