urlwatch: update to urlwatch-2.17
Changelog:
== [2.17] -- 2019-04-12
=== Added
- XPath/CSS: Support for excluding elements (#333, by Chenfeng Bao)
- Add support for using external `diff_tool` on Windows (#373, by Chenfeng Bao)
- Document how to use Amazon Simple E-Mail Service "SES" (by mborsetti)
- Compare data with multiple old versions (`compared_versions`, #328, by Chenfeng Bao)
=== Fixed
- YAML: Fix deprecation warnings (#367, by Florent Aide)
- Updated manpage with new options: Authentication, filter tests (Fixes #351)
- Text formatter: Do not emit empty lines for `line_length=0` (Fixes #357)
=== Changed
- SMTP configuration fix: Only use smtp.user config if it's a non-empty value
UnifiedSplitRaw