Add SVG as a default mime type

actionpack/CHANGELOG.md

+*   Add image/svg+xml as a default mime type.
+
+    *DHH*
+
 ## Rails 5.0.0.beta2 (February 01, 2016) ##
 
 *   Add `-g` and `-c` (short for _grep_ and _controller_ respectively) options

actionpack/lib/action_dispatch/http/mime_types.rb

@@ -14,6 +14,7 @@
 Mime::Type.register "image/gif", :gif, [], %w(gif)
 Mime::Type.register "image/bmp", :bmp, [], %w(bmp)
 Mime::Type.register "image/tiff", :tiff, [], %w(tif tiff)
+Mime::Type.register "image/svg+xml", :svg
 
 Mime::Type.register "video/mpeg", :mpeg, [], %w(mpg mpeg mpe)