Bump ember-cli-uglify from 2.0.0 to 3.0.0

Bumps [ember-cli-uglify](https://github.com/ember-cli/ember-cli-uglify) from 2.0.0 to 3.0.0.
- [Release notes](https://github.com/ember-cli/ember-cli-uglify/releases)
- [Changelog](https://github.com/ember-cli/ember-cli-uglify/blob/master/CHANGELOG.md)
- [Commits](ember-cli/ember-cli-terser@v2.0.0...v3.0.0)

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

package.json

@@ -50,7 +50,7 @@
     "ember-cli-moment-shim": "^3.5.0",
     "ember-cli-sass": "^10.0.1",
     "ember-cli-sri": "2.1.1",
-    "ember-cli-uglify": "^2.0.0",
+    "ember-cli-uglify": "^3.0.0",
     "ember-component-attributes": "^0.1.1",
     "ember-concurrency": "^1.1.3",
     "ember-data": "~2.18.2",