When we regex-check the MIME header we should also support zero space between the type and the charset, say "text/html;charset=utf-8".

lib/readability.ex

@@ -61,7 +61,7 @@ defmodule Readability do
             protect_attrs: ~r/^(?!id|rel|for|summary|title|href|src|alt|srcdoc)/i
            ]
 
-  @markup_mimes ~r/^(application|text)\/[a-z\-_\.\+]+ml(;\s+charset=.*)?$/i
+  @markup_mimes ~r/^(application|text)\/[a-z\-_\.\+]+ml(;\s*charset=.*)?$/i
 
   @type html_tree :: tuple | list
   @type raw_html :: binary