chore(deps): update dependency copy-webpack-plugin to v4.6.0

This MR contains the following updates:

Package	Type	Update	Change
copy-webpack-plugin	devDependencies	minor	4.5.2 -> 4.6.0

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Release Notes

webpack-contrib/copy-webpack-plugin

v4.6.0

Compare Source

Bug Fixes

• handle undefined and null as stats value (#​302) (78c5d12)

Features

• add support for target path transform (#​284) (7fe0c06)

4.5.4 (2018-10-18)

Bug Fixes

• processPattern: don't add 'glob' as directory when it is a file (contextDependencies) (#​296) (5670926)

4.5.3 (2018-10-10)

Bug Fixes

• processPattern: add glob directory context to contextDependencies (#​290) (5fa69db)

4.5.2 (2018-06-26)

Bug Fixes

• allow square brackets in path (#​264) (3ef5b6c), closes #​231

4.5.1 (2018-03-09)

Bug Fixes

• package: update cacache v10.0.1...10.0.4 (dependencies) (#​238) (0b288f9)

Performance Improvements

• index: switch to md4 for content hashing (#​239) (2be8191)

v4.5.4

Compare Source

Bug Fixes

• processPattern: don't add 'glob' as directory when it is a file (contextDependencies) (#​296) (5670926)

v4.5.3

Compare Source

Bug Fixes

• processPattern: add glob directory context to contextDependencies (#​290) (5fa69db)

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