Bump mixin-deep from 1.3.1 to 1.3.2

Bumps [mixin-deep](https://github.com/jonschlinkert/mixin-deep) from 1.3.1 to 1.3.2.
- [Release notes](https://github.com/jonschlinkert/mixin-deep/releases)
- [Commits](https://github.com/jonschlinkert/mixin-deep/compare/1.3.1...1.3.2

)

Signed-off-by: dependabot[bot] <support@github.com>

Convert i18n files to JSON5 format

Fix travis chrome install issue

Move item component

Search performance optimisations #2

Start Docker Compose for end-to-end (e2e) Testing

Typo in dropdown-field-parser.ts fixed

Clean build folder pre-tests

master travis test fixes

UI language cookie

Item relations edit delete

Entities grid templates

Collection pages, recent submissions: Added "empty" message

Bitstream format registries

Fix the labels on edit collection and community pages

Pagination messaging:  Hiding "Now Showing"

Modeled on browse-by.component.html