Bump babel-preset-minify from 0.2.0 to 0.4.0

Bumps [babel-preset-minify](https://github.com/babel/minify) from 0.2.0 to 0.4.0.
- [Release notes](https://github.com/babel/minify/releases)
- [Changelog](https://github.com/babel/minify/blob/master/CHANGELOG.md)
- [Commits](https://github.com/babel/minify/compare/gulp-babel-minify@0.2.0...gulp-babel-minify@0.4.0)

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