[Snyk] Fix for 3 vulnerable dependencies

Description

This PR fixes one or more vulnerable packages in the npm dependencies of this project. See the Snyk test report for more details.

Snyk Project: thegazelle-ad/gazelle-server:package.json

Snyk Organization: emilgoldsmith

Lockfile

If you are using package-lock.json or yarn.lock, please re-lock your dependencies and push an updated lockfile before merging this PR.

Changes included in this PR

Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
- package.json

Vulnerabilities that will be fixed

With an upgrade:

npm:extend:20180424
npm:is-url:20180319
npm:ua-parser-js:20180227

You can read more about Snyk's upgrade and patch logic in Snyk's documentation.

Check the changes in this PR to ensure they won't cause issues with your project.

Stay secure, The Snyk team

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thegazelle-ad / gazelle-server