update README.md

Author: x1unix

README.md

@@ -11,15 +11,16 @@ Improved Go Playground powered by Monaco Editor and React
 
 * 💡 Code autocomplete
 * 💾 Load and save files
-* 🛠 [WebAssembly](https://github.com/golang/go/wiki/WebAssembly) support (see [latest release notes](https://github.com/x1unix/go-playground/releases/tag/v1.3.0))
+* 📔 Snippets and tutorials
+* 🛠 [WebAssembly](https://github.com/golang/go/wiki/WebAssembly) support
 * 🌚 Dark theme
 
 
 And more
 
 ## Demo
 
-[http://goplay.x1unix.com/](http://goplay.x1unix.com/)
+[http://goplay.tools/](goplay.tools)
 
 ## Installation
 
@@ -40,6 +41,12 @@ $ ./playground -f ./data/packages.json -debug
 
 Use `-help` to get information about command params
 
+### Third-party credits
+
+* Default playground run server provided by [play.golang.org](https://play.golang.org)
+* Snippets for templates and tutorials provided by [gobyexample.com](https://gobyexample.com/) 
+
+
 ## Contributors
 
 ### Code Contributors