add copyright notice

Swatinem · Swatinem · commit aeeff33e51b9 · 2014-05-27T17:46:21.000+02:00
diff --git a/README.md b/README.md
@@ -60,3 +60,5 @@ instance.pets.push('Zwara'); // triggers change event
 
   LGPLv3
 
+  Released as free software as part of [ChatGrape](https://chatgrape.com/)
+

Original file line number	Diff line number	Diff line change
`@@ -60,3 +60,5 @@ instance.pets.push('Zwara'); // triggers change event`
`60`	`60`
`61`	`61`	`LGPLv3`
`62`	`62`
	`63`	`+ Released as free software as part of [ChatGrape](https://chatgrape.com/)`
	`64`	`+`