Update minor devDeps

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
postcss (source)	devDependencies	patch	7.0.29 -> 7.0.30
webpack-dev-server	devDependencies	minor	3.10.3 -> 3.11.0

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Release Notes

postcss/postcss

v7.0.30

Compare Source

• Fix TypeScript definition (by Natalie Weizenbaum).

webpack/webpack-dev-server

v3.11.0

Compare Source

Features

• add icons for directory viewer (#​2441) (e953d01)
• allow multiple contentBasePublicPath paths (#​2489) (c6bdfe4)
• emit progress-update (#​2498) (4808abd), closes #​1666
• add invalidate endpoint (#​2493) (89ffb86)
• allow open option to accept an object (#​2492) (adeb92e)

Bug Fixes

• do not swallow errors from server (#​2512) (06583f2)
• security vulnerability in yargs-parser (#​2566) (41d1d0c)
• don't crash on setupExitSignals(undefined) (#​2507) (0d5c681)
• support entry descriptor (closes #​2453) (#​2465) (8bbef6a)
• update jquery (#​2516) (99ccfd8)

3.10.3 (2020-02-05)

Bug Fixes

• forward error requests to the proxy (#​2425) (e291cd4)

3.10.2 (2020-01-31)

Bug Fixes

• fallthrough non GET and HEAD request to routes (#​2374) (ebe8eca)
• add an optional peer dependency on webpack-cli (#​2396) (aa365df)
• add heartbeat for the websocket server (#​2404) (1a7c827)

3.10.1 (2019-12-19)

Bug Fixes

• ie11 compatibility (1306abe)

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