Add jsdoc to meteorgram dev dependencies

content/js/meteorogram/package.json

@@ -12,11 +12,12 @@
     "underscore": "^1.8.3"
   },
   "devDependencies": {
-    "@babel/core": "^7.0.0-beta.4",
-    "@babel/preset-env": "^7.0.0-beta.4",
-    "babel-core": "^6.26.0",
+    "@babel/core": "^7.4.0",
+    "@babel/preset-env": "^7.4.2",
+    "babel-core": "^6.26.3",
     "babel-loader": "^7.1.2",
     "babel-preset-es2015": "^6.24.1",
+    "jsdoc": "^3.5.5",
     "uglifyjs-webpack-plugin": "^1.0.1",
     "webpack": "^3.8.1"
   },