Update webpack in / from 3.6.0 to 4.21.0

[ghost]

Dependencies.io has updated webpack (a npm dependency in /) from "3.6.0" to "4.21.0".

4.21.0

Features

• add output.libraryTarget: "amd-require" which generates a AMD require([], ...) wrapper instead of a define([], ...) wrapper
• support arrays of strings passed to output.library, which exposes the library to a subproperty

Bugfixes

• fix cases where __webpack_require__.e is used at runtime but is not defined in the bundle
• fix behavior of externals of global type

Performance

• Some performance improvements to the chunk graph generation