Update README.md

Author: ZsharE

README.md

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 A simple and easy jQuery plugin for highlighting .NET stack traces
 
 #### Stacktrace - Language support
-[![English](images/flags/USA-flag.png)](#) [![Danish](images/flags/Denmark-flag.png)](#) [![German](images/flags/Germany-flag.png)](#) [![Russian](images/flags/Russia-flag.png)](#)
+[![English](images/flags/US%20-%20United%20States.svg)](#) [![Danish](images/flags/DK%20-%20Denmark.svg)](#) [![German](images/flags/DE%20-%20Germany.svg)](#) [![Russian](images/flags/RU%20-%20Russian%20Federation.svg)](#) [![Chinese](images/flags/CN%20-%20China.svg)](#)
 
 #### Demo
 [![netStack.js - demo](images/example.jpg)](https://elmah.io/tools/stack-trace-formatter/)