Streamlined dependencies

package.json

@@ -9,7 +9,6 @@
   },
   "dependencies": {
     "connect": "^3.7.0",
-    "js-yaml": "^3.13.1",
     "register-service-worker": "^1.6.2",
     "serve-static": "^1.14.1",
     "v-tooltip": "^2.1.3",
@@ -20,10 +19,10 @@
     "vue-select": "^3.11.2"
   },
   "devDependencies": {
-    "@vue/cli-plugin-babel": "^3.10.0",
-    "@vue/cli-plugin-eslint": "^3.9.0",
-    "@vue/cli-plugin-pwa": "^3.9.0",
-    "@vue/cli-service": "^3.9.0",
+    "@vue/cli-plugin-babel": "^4.5.12",
+    "@vue/cli-plugin-eslint": "^4.5.12",
+    "@vue/cli-plugin-pwa": "^4.5.12",
+    "@vue/cli-service": "^4.5.12",
     "@vue/eslint-config-standard": "^4.0.0",
     "babel-eslint": "^10.0.1",
     "eslint": "^5.16.0",