1.3.0

Dropped support for OTP 21, minimal OTP version is now 22
This follows the support pattern for rebar3

Main changes:

• In HTML sanitizer, add rel="nofollow noopener noreferrer" to links with a target attribute
• More restrictive sanitize of links

1.2.3

Compatibility with OTP 23.

Also fix a type spec in z_html.erl

1.0.0-alpha4

Show positive number for BCE years