Fixed DroidSans font link (#1460)

extra_fonts/README.txt

diff --git a/extra_fonts/README.txt b/extra_fonts/README.txt
index a413608..5d41a6b 100644
--- a/extra_fonts/README.txt
+++ b/extra_fonts/README.txt
@@ -153,7 +153,7 @@
  DroidSans.ttf
    Copyright (c) Steve Matteson
    Apache License, version 2.0
-   http://www.google.com/fonts/specimen/Droid+Sans
+   https://www.fontsquirrel.com/fonts/droid-sans
 
  ProggyClean.ttf
    Copyright (c) 2004, 2005 Tristan Grimmer