hyperlinks in about menu

about.py

@@ -5,23 +5,28 @@
 from kivy.properties import StringProperty
 from kivy.uix.popup import Popup
 import pkg_resources
+import webbrowser
+
 
 class AboutPopup(Popup):
-   about_text = StringProperty(f'''[b]Youtube-Dl Kivy[/b] 
+    about_text = StringProperty(f'''[ref=https://github.com/odrevet/youtube-dl-kivy][b]Youtube-Dl Kivy[/b][/ref] 
 2020 Olivier Drevet
 Version 0.2 
 Released Under the GPL-v3 License
 
-[b]Youtube-dl[/b] 
+[ref=https://youtube-dl.org/][b]Youtube-dl[/b][/ref] 
 Version {pkg_resources.get_distribution('Youtube-dl').version} 
 Unlicense License
 
-[b]Kivy[/b]
+[ref=https://kivy.org][b]Kivy[/b][/ref]
 Version {kivy.__version__}
 MIT License
 
-[b]Python[/b] 
+[ref=https://www.python.org][b]Python[/b][/ref] 
 Version {sys.version}
 
-[b]Icons[/b]
-by Freepik from www.flaticon.com''')
+[ref=https://www.flaticon.com][b]Icons[/b][/ref]
+by Freepik from www.flaticon.com''')
+
+    def on_ref_press(self, url):
+        webbrowser.open(url)