Log Message:
regal: Update to 0.15.0

Changes:
0.15.0
------
This release brings 2 new linter rules, and a few improvements and fixes.

- New rule: `deprecated-builtin`
- New rule: `default-over-not`
- Other improvements
    - Ignore directives can now be placed anywhere in a comment, and not
      just at the start of one.
- Several bugs fixes