fix(package) Add url for compatibility with webpack@5 (#1598)

[glenjamin]

• This is a bugfix
• This is a feature
• This is a code refactor
• This is a test update
• This is a docs update
• This is a metadata update

For Bugs and Features; did you add new tests?

Didn't add tests, as this would require CI to run against webpack v5 to exhibit the problem.

Can reproduce the issue and confirm the fix by installing webpack v5 into this package and running the prepare script.

Motivation / Use-Case

fixes #1598

Breaking Changes

none

Additional Info

[codecov]

Codecov Report

Merging #1599 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1599   +/-   ##
=======================================
  Coverage   74.06%   74.06%           
=======================================
  Files          10       10           
  Lines         671      671           
=======================================
  Hits          497      497           
  Misses        174      174

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