Bump @exercism/babel-preset-javascript from 0.2.1 to 0.5.0

Bumps @exercism/babel-preset-javascript from 0.2.1 to 0.5.0.

---
updated-dependencies:
- dependency-name: "@exercism/babel-preset-javascript"
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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