[Enhancement] Update vue-chartjs to fix production build (#182)

package.json

@@ -13,12 +13,12 @@
   "dependencies": {
     "@babel/polyfill": "^7.6.0",
     "@rails/actioncable": "^6.0.0",
+    "@babel/preset-env": "~7.3.4",
     "@rails/webpacker": "^4.0.7",
     "axios": "^0.19.0",
     "babel-helper-vue-jsx-merge-props": "^2.0.3",
     "babel-plugin-syntax-jsx": "^6.18.0",
     "babel-plugin-transform-vue-jsx": "^3.7.0",
-    "babel-preset-env": "^1.7.0",
     "bourbon": "^6.0.0",
     "chart.js": "~2.5.0",
     "dotenv": "^8.0.0",
@@ -37,7 +37,7 @@
     "vue-aplayer": "~0.1.1",
     "vue-audio": "~0.0.7",
     "vue-axios": "~1.2.2",
-    "vue-chartjs": "~2.6.2",
+    "vue-chartjs": "^3.4.2",
     "vue-clickaway": "~2.1.0",
     "vue-i18n": "~5.0.3",
     "vue-loader": "^15.7.0",