build(deps): bump ember-cli-babel from 6.14.1 to 6.15.0

[dependabot-preview[bot]]

Bumps ember-cli-babel from 6.14.1 to 6.15.0.

Changelog

*Sourced from [ember-cli-babel's changelog](https://github.com/babel/ember-cli-babel/blob/master/CHANGELOG.md).* > # Changelog

Commits

- [`160bd60`](https://github.com/babel/ember-cli-babel/commit/160bd60ebb79ad08f2d99693467daeddd590b6df) release v6.15.0 🎉 - [`4e4d65a`](https://github.com/babel/ember-cli-babel/commit/4e4d65a40b43e336ebf14f7455abc9edc17f2477) fix docs re: throwUnlessParallelizable - [`cb5a382`](https://github.com/babel/ember-cli-babel/commit/cb5a3828057fef9548c5474cd3a24e1d337474bf) Merge pull request [#230](https://github-redirect.dependabot.com/babel/ember-cli-babel/issues/230) from kellyselden/babel-plugin-debug-macros - [`98e266d`](https://github.com/babel/ember-cli-babel/commit/98e266d07d84537e026643dd056b1c53b97fc41c) update babel-plugin-debug-macros to 0.2.0-beta.6 - [`8d8c591`](https://github.com/babel/ember-cli-babel/commit/8d8c5919f123073289ed31ac567e4dba8f8abddf) Merge pull request [#225](https://github-redirect.dependabot.com/babel/ember-cli-babel/issues/225) from Turbo87/changelog - [`19f5225`](https://github.com/babel/ember-cli-babel/commit/19f522515d66fb4c9adb34adae2b55064bb54395) Update Changelog - See full diff in [compare view](https://github.com/babel/ember-cli-babel/compare/v6.14.1...v6.15.0)

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[dependabot-preview[bot]]

Superseded by #38.