fix: optionalDependencies -> devDependencies

package.json

@@ -22,32 +22,34 @@
   "contributors": ["Estelle DeBlois", "Mike North"],
   "license": "MIT",
   "devDependencies": {
+    "@mike-north/js-lib-semantic-release-config": "1.0.1",
     "broccoli-asset-rev": "^3.0.0",
-    "ember-cli": "^3.5.0",
     "ember-cli-app-version": "^3.2.0",
     "ember-cli-changelog": "^0.3.4",
     "ember-cli-dependency-checker": "^3.0.0",
     "ember-cli-eslint": "^5.0.0",
-    "ember-cli-htmlbars": "^3.0.0",
     "ember-cli-htmlbars-inline-precompile": "^2.0.0",
+    "ember-cli-htmlbars": "^3.0.0",
     "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-sri": "^2.1.0",
     "ember-cli-uglify": "^2.1.0",
+    "ember-cli": "^3.5.0",
     "ember-disable-prototype-extensions": "^1.1.2",
     "ember-export-application-global": "^2.0.0",
     "ember-load-initializers": "^2.0.0",
     "ember-maybe-import-regenerator": "^0.1.6",
     "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",
     "husky": "^1.1.3",
     "loader.js": "^4.7.0",
+    "semantic-release": "^15.10.8",
     "prettier": "^1.15.2"
   },
   "keywords": ["ember-addon", "d3"],
@@ -75,9 +77,5 @@
   },
   "release": {
     "extends": "@mike-north/js-lib-semantic-release-config"
-  },
-  "optionalDependencies": {
-    "@mike-north/js-lib-semantic-release-config": "1.0.1",
-    "semantic-release": "^15.10.8"
   }
 }