Update various dependency packages to latest.

package.json

@@ -24,28 +24,28 @@
     "ember-cli-babel": "^7.4.0"
   },
   "devDependencies": {
-    "@ember/optional-features": "^0.6.3",
+    "@ember/optional-features": "^0.7.0",
     "ember-cli": "~3.7.1",
-    "ember-cli-dependency-checker": "^3.0.0",
+    "ember-cli-dependency-checker": "^3.1.0",
     "ember-cli-htmlbars": "^3.0.0",
-    "ember-cli-htmlbars-inline-precompile": "^1.0.3",
-    "ember-cli-inject-live-reload": "^1.8.2",
+    "ember-cli-htmlbars-inline-precompile": "^2.1.0",
+    "ember-cli-inject-live-reload": "^2.0.1",
     "ember-disable-prototype-extensions": "^1.1.3",
-    "ember-load-initializers": "^1.1.0",
+    "ember-load-initializers": "^2.0.0",
     "ember-maybe-import-regenerator": "^0.1.6",
-    "ember-qunit": "^3.4.1",
+    "ember-qunit": "^4.2.0",
     "ember-resolver": "^5.0.1",
     "ember-source": "~3.7.2",
     "ember-source-channel-url": "^1.1.0",
     "ember-try": "^1.0.0",
     "eslint": "^5.12.1",
     "eslint-config-prettier": "^4.0.0",
-    "eslint-plugin-ember": "^5.2.0",
-    "eslint-plugin-node": "^7.0.1",
+    "eslint-plugin-ember": "^6.1.0",
+    "eslint-plugin-node": "^8.0.1",
     "eslint-plugin-prettier": "^3.0.1",
     "loader.js": "^4.7.0",
     "prettier": "^1.16.1",
-    "qunit-dom": "^0.8.0"
+    "qunit-dom": "^0.8.4"
   },
   "engines": {
     "node": "6.* || 8.* || >= 10.*"