Bump @superdesk/build-tools from 1.0.18 to 2.0.1 in /client

Bumps @superdesk/build-tools from 1.0.18 to 2.0.1.

---
updated-dependencies:
- dependency-name: "@superdesk/build-tools"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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