Update dependency thread-loader to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
thread-loader	^3.0.0 → ^4.0.0

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Release Notes

webpack-contrib/thread-loader (thread-loader)

v4.0.4

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v4.0.3

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v4.0.2

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v4.0.1

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v4.0.0

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Features

• add target, minimize and resourceQuery into context (#​25) (f3c7a2c)

1.1.5 (2018-02-26)

Bug Fixes

• package: add webpack >= 4 (peerDependencies) (#​22) (9345756)
• WorkerError: handle undefined error stacks (#​20) (6fb5daf)

1.1.4 (2018-02-21)

Bug Fixes

• index: add webpack >= v4.0.0 support (#​16) (5d33937)

1.1.3 (2018-02-07)

Bug Fixes

• WorkerPool: trace stacks to avoid duplicated err.messages from workers (#​13) (80dda4f)

1.1.2 (2017-10-09)

Bug Fixes

• readBuffer: handle 0-byte reads (c7ca960)

1.1.1 (2017-08-28)

Bug Fixes

• context: Pass context to loader (29ced70)
• deps: pass along result for dependencies (19832ec)
• example: fix for broken sass and add watch (47ba43e)

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