Bump @exercism/babel-preset-javascript from 0.4.0 to 0.5.1 (#896)

Bumps @exercism/babel-preset-javascript from 0.4.0 to 0.5.1.

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

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