Update dependency django-webpack-loader to ^0.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-webpack-loader	^0.5.0 -> ^0.7.0

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Release Notes

django-webpack/django-webpack-loader (django-webpack-loader)

### [`v0.7.0`](https://togithub.com/django-webpack/django-webpack-loader/releases/tag/0.7.0) [Compare Source](https://togithub.com/django-webpack/django-webpack-loader/compare/0.6.0...0.7.0) Added support for custom loader classes: https://github.com/owais/django-webpack-loader/#loader_class ### [`v0.6.0`](https://togithub.com/django-webpack/django-webpack-loader/blob/HEAD/CHANGELOG.md#060----2018-02-22) [Compare Source](https://togithub.com/django-webpack/django-webpack-loader/compare/0.5.0...0.6.0) - Added support for 'Access-Control-Allow-Origin' header - Read stats file with unicode support - Cleaned up exceptions - Updated and corrected docs

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Configuration

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