include nlohmann/json in inja directly

README.md

@@ -22,11 +22,11 @@ inja::render("Hello {{ name }}!", data); // Returns "Hello world!"
 
 ## Integration
 
-Inja is a headers only library, which can be downloaded from the [releases](https://github.com/pantor/inja/releases) or directly from the `src/` folder. Inja uses json by nlohmann as its single dependency, so make sure that it is included before inja. json can be found [here](https://github.com/nlohmann/json/releases).
+Inja is a headers only library, which can be downloaded from the [releases](https://github.com/pantor/inja/releases) or directly from the `src/` folder. Inja uses `nlohmann/json.hpp` as its single dependency, so make sure it can be included from `inja.hpp`. json can be downloaded [here](https://github.com/nlohmann/json/releases). Then integration is as easy as:
 
 ```c++
-#include "json.hpp"
-#include "inja.hpp"
+#include <inja.hpp>
+#include <nlohmann/json.hpp>
 
 // For convenience
 using namespace inja;