Use SVG for favicon

Author: inexorabletash

index.bs

@@ -18,7 +18,7 @@ Editor: Joshua Bell, Google Inc. https://google.com, [email protected]
 Group: webapps
 Repository: w3c/IndexedDB
 Test Suite: https://github.com/web-platform-tests/wpt/tree/master/IndexedDB
-Favicon: logo-db.png
+Favicon: logo-db.svg
 Complain About: accidental-2119 yes
 Markup Shorthands: css no, markdown yes
 </pre>