Update dependency ember-resolver to v8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
ember-resolver	devDependencies	major	^7.0.0 -> ^8.0.0

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Release Notes

ember-cli/ember-resolver

### [`v8.0.0`](https://togithub.com/ember-cli/ember-resolver/blob/master/CHANGELOG.md#v800-2020-04-11) [Compare Source](https://togithub.com/ember-cli/ember-resolver/compare/v7.0.0...v8.0.0) ##### :boom: Breaking Change - [#​542](https://togithub.com/ember-cli/ember-resolver/pull/542) Remove automatic dasherization of modifiers. ([@​rwjblue](https://togithub.com/rwjblue)) - [#​532](https://togithub.com/ember-cli/ember-resolver/pull/532) Drop support for Node 8 ([@​buschtoens](https://togithub.com/buschtoens)) ##### :bug: Bug Fix - [#​531](https://togithub.com/ember-cli/ember-resolver/pull/531) Fix resolving `@scope/name` namespaces ([@​buschtoens](https://togithub.com/buschtoens)) ##### Committers: 2 - Jan Buschtöns ([@​buschtoens](https://togithub.com/buschtoens)) - Robert Jackson ([@​rwjblue](https://togithub.com/rwjblue))

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