Update rimraf requirement from 2.5.4 to 3.0.0 in /webpack/code-splitting

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Updates the requirements on rimraf to permit the latest version.

Changelog

Sourced from rimraf's changelog.

v3.0

• Add --preserve-root option to executable (default true)
• Drop support for Node.js below version 6

v2.7

• Make glob an optional dependency

2.6

• Retry on EBUSY on non-windows platforms as well
• Make rimraf.sync 10000% more reliable on Windows

2.5

• Handle Windows EPERM when lstat-ing read-only dirs
• Add glob option to pass options to glob

2.4

• Add EPERM to delay/retry loop
• Add disableGlob option

2.3

• Make maxBusyTries and emfileWait configurable
• Handle weird SunOS unlink-dir issue
• Glob the CLI arg for better Windows support

2.2

• Handle ENOENT properly on Windows
• Allow overriding fs methods
• Treat EPERM as indicative of non-empty dir
• Remove optional graceful-fs dep
• Consistently return null error instead of undefined on success
• win32: Treat ENOTEMPTY the same as EBUSY
• Add rimraf binary

2.1

• Fix SunOS error code for a non-empty directory
• Try rmdir before readdir
• Treat EISDIR like EPERM
• Remove chmod
• Remove lstat polyfill, node 0.7 is not supported

2.0

... (truncated)

Commits

• 191ae69 3.0.0
• d6ab4ec feat: add --preserve-root (default) option
• 736887a const/let and arrow functions in bin script
• d7e41a2 Use arrow functions
• 592a4b6 Use const/let
• a01826d push to git with one command, not two
• bb57274 2.7.1
• 012ecbb fix: use var instead of let
• 250ee15 2.7.0
• dc1682d feat: make it possible to omit glob dependency
• Additional commits viewable in compare view

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