Update README.md

Author: HackMemory

README.md

@@ -19,5 +19,5 @@ DFFI::MessageBoxA(0, "Hello", "HelloWorld", 0);
 ## API Documentation
 [api-docs](api-docs/)
 
-## Bundle for develnext
+## Bundle for DevelNext
 [Download](https://github.com/jphp-group/jphp-dffi-ext/releases/download/1.0.0/dn-dffi-bundle.dnbundle)