[Snyk] Security upgrade jquery from 3.4.1 to 3.5.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

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Changes included in this PR

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

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Cross-site Scripting (XSS) SNYK-JS-JQUERY-567880	No	No Known Exploit

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

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[johannesduesing]

I Fixed the Travis CI Error in this branch, and the version bump looks good to me. However, i don't know why snyk and codacy are not reporting their status on this PR..