Don't use &, < and > for escaping &, < and > #49
Description
The XML spec. clearly states that these chars have to be escaped, and FeedWriter does that. But the RSS Best Practices recommends using the hexadecimal character reference:
A publisher should encode "&" and "<" in plain text using hexadecimal character references. When encoding the ">" character, a publisher should use the hexadecimal reference >.
This maximizes the compatibility with clients.