[docs] Update @material-ui/pickers

[eps1lon]

Note to self: Don't bump manually. Just open a PR for the specific dependency.

Don't know why dependabot didn't pick this up. Taken from eps1lon/material-ui-playroom#31:

Bumps @material-ui/pickers from 3.2.0 to 3.2.1.

Release notes

Sourced from @material-ui/pickers's releases.

v3.2.1

Big thanks to 4 contributors that make this release possible 👍

Features

We have enabled treeshaking by moving our build system from rollup to plain babel esm export.
Treeshaking should work out of the box with webpack right now.

We are intent on moving back to rollup once everything will be right

Fixes / Ehancements

• Fix crashing on orientation change for some old Android devices (#1207)
• Support auto detection of orientation change for IOS Safari (#1207)
• Add inputProps to the outputted typescript definitions (#1208)
• Fix dispatching 2 onChange events with variant="inline" (#1209)
• Add shorthand hook for static state managment (#1212)
• Fix case when both clear button & showToday button (#1211)
• [docs] Update CSS overrides example (#1201) @​pschyma
• [docs] Add redux form integration example (#1189) @​igornfaustino
• [docs] Add releases page (#1210)

Commits

• efd370d v3.2.1
• 92d8665 Update packages (#1217)
• d3f2288 Add babel transpilation to esm (#1206)
• c400708 fix when both clear button & showToday button (#1211)
• 988664d [KeyboardDateInput] Fix not updating formatter when new mask passed (#1213)
• e616a2b Add shorthand for static state managment (#1212)
• 33a803f Fix grammar
• c4c9f80 Add releases page (#1210)
• 41fa537 Fix dispatching 2 onChange events with variant="inline" (#1209)
• 42b2cad Add inputProps to the outputted typescript definitions (#1208)
• Additional commits viewable in compare view

[mui-pr-bot]

No bundle size changes comparing b654a9c...bc2a7c0

Generated by 🚫 dangerJS against bc2a7c0

[eps1lon]

So it is an issue with the playroom.