chore(deps-dev): bump ember-cli from 3.9.0-beta.2 to 3.9.0 (#5)

Bumps [ember-cli](https://github.com/ember-cli/ember-cli) from 3.9.0-beta.2 to 3.9.0.
<details>
<summary>Release notes</summary>

*Sourced from [ember-cli's releases](https://github.com/ember-cli/ember-cli/releases).*

> ## Dancing with Sharks
> ## Setup
> 
> `npm install -g ember-cli@3.9.0` -- Install new global ember-cli
> 
> ## Project Update
> 
> 1. Run `npx ember-cli-update --to 3.9.0` -- This will update your app or addon to the latest ember-cli release. You will probably encounter merge conflicts that you should resolve in your normal git workflow.
> 2. Run `npx ember-cli-update --run-codemods` -- This will let you pick codemods to run against your project, to ensure you are using the latest patterns and platform features.
> 
> ## Changelog
> 
> #### Blueprint Changes
> 
> - [`ember new` diff](ember-cli/ember-new-output@v3.8.2...v3.9.0)
> - [`ember addon` diff](ember-cli/ember-addon-output@v3.8.2...v3.9.0)
> 
> #### Community Contributions
> 
> - [#8444](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8444) Ensure Node 11 does not issue warning [@&#8203;jeanduplessis](https://github.com/jeanduplessis)
> - [#8425](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8425) Update Broccoli website URL [@&#8203;hakilebara](https://github.com/hakilebara)
> - [#8383](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8383) Update `ember-welcome-page` usage to angle brackets [@&#8203;locks](https://github.com/locks)
> - [#8435](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8435) Don't add extra slash in dist paths [@&#8203;knownasilya](https://github.com/knownasilya)
> - [#8358](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8358) In MU apps, exclude TS test files from the app JS file [@&#8203;ppcano](https://github.com/ppcano)
> - [#8373](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8373) package-info-cache: Add `heimdalljs-logger` logging [@&#8203;Turbo87](https://github.com/Turbo87)
> - [#8379](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8379) Fix the module path for MU non-acceptance tests [@&#8203;ppcano](https://github.com/ppcano)
> - [#8387](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8387) Fix non-acceptance tests for MU addons [@&#8203;ppcano](https://github.com/ppcano)
> - [#8289](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8289) Include addon styles for MU apps [@&#8203;ppcano](https://github.com/ppcano)
> - [#8399](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8399) Improve jQuery deprecation message [@&#8203;simonihmig](https://github.com/simonihmig)
> - [#8397](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8397) Update packages [@&#8203;btecu](https://github.com/btecu)
> - [#8432](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8432) Fix how MU blueprints fetches `ember-source` [@&#8203;ppcano](https://github.com/ppcano)
> - [#8433](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8433) MU blueprints: enable `EMBER_MODULE_UNIFICATION` feature flag [@&#8203;ppcano](https://github.com/ppcano)
> - [#8414](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8414) `preprocessTemplates` is called only once in MU layout [@&#8203;ppcano](https://github.com/ppcano)
> - [#8434](https://github-redirect.dependabot.com/ember-cli/ember-cli/pull/8434) Fix comment on the `environment.js` blueprint files [@&#8203;ppcano](https://github.com/ppcano)
> 
> Thank you to all who took the time to contribute!
</details>
<details>
<summary>Changelog</summary>

*Sourced from [ember-cli's changelog](https://github.com/ember-cli/ember-cli/blob/master/CHANGELOG.md).*

> # ember-cli Changelog
</details>
<details>
<summary>Commits</summary>

- [`e40d3dd`](ember-cli/ember-cli@e40d3dd) Release v3.9.0
- [`a76b734`](ember-cli/ember-cli@a76b734) Update Ember and Ember Data to v3.9.0
- [`bccb99e`](ember-cli/ember-cli@bccb99e) Merge tag 'v3.8.2' into beta
- [`0e12214`](ember-cli/ember-cli@0e12214) Release v3.8.2
- [`741cbd3`](ember-cli/ember-cli@741cbd3) Merge pull request [#8556](https://github-redirect.dependabot.com/ember-cli/ember-cli/issues/8556) from Turbo87/packager-source-maps
- [`4e607ba`](ember-cli/ember-cli@4e607ba) Ensure packager respects source map config when concatting
- [`02f7844`](ember-cli/ember-cli@02f7844) Merge pull request [#8370](https://github-redirect.dependabot.com/ember-cli/ember-cli/issues/8370) from pzuraq/bugfix/use-module-name-for-templates-lts
- [`8e74f63`](ember-cli/ember-cli@8e74f63) add tests
- [`6259c53`](ember-cli/ember-cli@6259c53) [BUGFIX] Use moduleName() for templates
- [`fcde394`](ember-cli/ember-cli@fcde394) Merge pull request [#8482](https://github-redirect.dependabot.com/ember-cli/ember-cli/issues/8482) from boris-petrov/update-ember-ajax-in-blueprints
- Additional commits viewable in [compare view](ember-cli/ember-cli@v3.9.0-beta.2...v3.9.0)
</details>
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Author: dependabot[bot]

package.json

@@ -41,7 +41,7 @@
     "@clark/eslint-config-node": "^0.5.0",
     "@ember/optional-features": "^0.7.0",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "~3.9.0-beta.2",
+    "ember-cli": "~3.9.0",
     "ember-cli-babel": "^7.7.0",
     "ember-cli-dependency-checker": "^3.0.0",
     "ember-cli-htmlbars": "^3.0.0",

yarn.lock

@@ -3224,10 +3224,10 @@ ember-cli-version-checker@^3.0.0, ember-cli-version-checker@^3.0.1:
     resolve-package-path "^1.2.6"
     semver "^5.6.0"
 
-ember-cli@~3.9.0-beta.2:
-  version "3.9.0-beta.2"
-  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.9.0-beta.2.tgz#93c82d6b07b3dff57e06eace9c4b5ae8e1bae870"
-  integrity sha512-Lph7sKr4Yzk+an1qUo8D++c4oy+VNt7t2Qxv/CG/NR56VqFl+UT4haDs1BegwAtdnZU5iLZRTl6HkZ8WEubI7Q==
+ember-cli@~3.9.0:
+  version "3.9.0"
+  resolved "https://registry.yarnpkg.com/ember-cli/-/ember-cli-3.9.0.tgz#7ee8120c48514488c692265c4a429625e8f0187e"
+  integrity sha512-y5PAdj08BApNUXL4IL4rOo3+8M6BQKobCx2zvczCyu9jjPaxfZ+X/xEw6UHXe5F3i3tWm7IwX9kG6sz5pv7vuQ==
   dependencies:
     "@babel/core" "^7.0.0"
     "@babel/plugin-transform-modules-amd" "^7.2.0"