Bump lodash.mergewith from 4.6.1 to 4.6.2 in /todo-app (#8)

Bumps [lodash.mergewith](https://github.com/lodash/lodash) from 4.6.1 to 4.6.2.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](https://github.com/lodash/lodash/commits)

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