Bump string.prototype.trimend from 1.0.3 to 1.0.4 (#33)

Bumps [string.prototype.trimend](https://github.com/es-shims/String.prototype.trimEnd) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/es-shims/String.prototype.trimEnd/releases)
- [Changelog](https://github.com/es-shims/String.prototype.trimEnd/blob/main/CHANGELOG.md)
- [Commits](es-shims/String.prototype.trimEnd@v1.0.3...v1.0.4)

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