v1.4.1

What's Changed

• slugify in k8s extra by @lsbardel in #61
• Refactor workers by @lsbardel in #62
• more coverage by @lsbardel in #63

Refactor of Worker utils, largely backward incompatible for people using low-level workers.
Cleaner and much more documented API.

Full Changelog: v1.3.4...v1.4.1