Merge branch 'fix/theora-detection-read-bytes' into 'develop'

Fix Theora detection in mime.ex

See merge request pleroma/pleroma!493

lib/pleroma/mime.ex

@@ -3,7 +3,7 @@ defmodule Pleroma.MIME do
   Returns the mime-type of a binary and optionally a normalized file-name.
   """
   @default "application/octet-stream"
-  @read_bytes 31
+  @read_bytes 35
 
   @spec file_mime_type(String.t()) ::
           {:ok, content_type :: String.t(), filename :: String.t()} | {:error, any()} | :error