[Snyk] Security upgrade pug from 2.0.4 to 3.0.1

[ColinMaudry]

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

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:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	691/1000 Why? Recently disclosed, Has a fix available, CVSS 8.1	Remote Code Execution (RCE) SNYK-JS-PUG-1071616	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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

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For more information:
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📚 Read more about Snyk's upgrade and patch logic

[coveralls]

Coverage decreased (-1.1%) to 71.322% when pulling 90df6c9 on snyk-fix-dad58d7baf029f5b36c3f157c0339f36 into 26c0996 on master.