Update README.md

Author: jaywcjlove

README.md

@@ -22,4 +22,8 @@ var openBrowsers = require('open-browsers');
 if (openBrowsers('http://localhost:3000')) {
   console.log('The browser tab has been opened!');
 }
-```
+```
+
+### License
+
+`open-browsers` is open source software licensed as MIT.