Bump superdesk-planning from da528c6 to 3f640b1 in /client (#210)

Bumps [superdesk-planning](https://github.com/superdesk/superdesk-planning) from `da528c6` to `3f640b1`.
- [Release notes](https://github.com/superdesk/superdesk-planning/releases)
- [Commits](superdesk/superdesk-planning@da528c6...3f640b1)

---
updated-dependencies:
- dependency-name: superdesk-planning
  dependency-type: direct:production
...

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