fix: optionalDependencies -> devDependencies

package.json

@@ -26,35 +26,33 @@
     "@commitlint/travis-cli": "7.2.1",
     "@ember/jquery": "0.5.2",
     "@ember/optional-features": "0.7.0",
+    "@mike-north/js-lib-renovate-config": "1.0.0",
+    "@mike-north/js-lib-semantic-release-config": "1.0.0",
     "broccoli-asset-rev": "3.0.0",
-    "ember-cli": "3.5.1",
     "ember-cli-dependency-checker": "3.0.0",
     "ember-cli-eslint": "5.0.0",
-    "ember-cli-htmlbars": "3.0.1",
     "ember-cli-htmlbars-inline-precompile": "2.0.0",
+    "ember-cli-htmlbars": "3.0.1",
     "ember-cli-inject-live-reload": "2.0.1",
     "ember-cli-qunit": "4.4.0",
     "ember-cli-release": "1.0.0-beta.2",
     "ember-cli-shims": "1.2.0",
     "ember-cli-test-loader": "2.2.0",
     "ember-cli-uglify": "2.1.0",
+    "ember-cli": "3.5.1",
     "ember-disable-prototype-extensions": "1.1.3",
     "ember-disable-proxy-controllers": "1.0.2",
     "ember-export-application-global": "2.0.0",
     "ember-load-initializers": "2.0.0",
     "ember-resolver": "5.0.1",
-    "ember-source": "3.5.1",
     "ember-source-channel-url": "1.1.0",
+    "ember-source": "3.5.1",
     "ember-try": "1.1.0",
     "eslint-plugin-ember": "5.4.0",
     "eslint-plugin-node": "8.0.0",
-    "loader.js": "4.7.0"
-  },
-  "optionalDependencies": {
-    "@mike-north/js-lib-renovate-config": "1.0.0",
-    "@mike-north/js-lib-semantic-release-config": "1.0.0",
     "semantic-release": "^15.10.8",
-    "travis-deploy-once": "^5.0.9"
+    "travis-deploy-once": "^5.0.9",
+    "loader.js": "4.7.0"
   },
   "keywords": [
     "ember-addon"