Use better URI quoting characters in ticket change reporter

Currently ticket URIs are quoted with square brackets `[]`, which may look pretty but are unfortunately annoying because they're reserved characters and not intended for use as delimiting a URI in context; from [RFC3896](https://tools.ietf.org/html/rfc3986#section-2.2):

> If data for a URI component would conflict with a reserved
> character's purpose as a delimiter, then the conflicting data must be
> percent-encoded before the URI is formed.

[Recommended ways](https://tools.ietf.org/html/rfc3986#appendix-C) of delimiting a URI in context are: Double-quotes `""`, whitespace or, my personal favourite, angle brackets `<>`.