add basic babel setup

.babelrc

@@ -0,0 +1,3 @@
+{
+    "presets": ["env", "stage-2"]
+}

package.json

@@ -7,8 +7,15 @@
     "ioredis": "^4.1.0",
     "koa": "^2.5.3"
   },
-  "devDependencies": {},
-  "scripts": {},
+  "devDependencies": {
+    "babel-cli": "^6.26.0",
+    "babel-preset-env": "^1.7.0",
+    "babel-preset-stage-2": "^6.24.1",
+    "nodemon": "^1.18.4"
+  },
+  "scripts": {
+    "start": "nodemon --exec babel-node --presets env,stage-2 src/index.js"
+  },
   "keywords": [],
   "author": "",
   "license": "ISC"

src/index.js

@@ -0,0 +1 @@
+console.log('Hello Node.js project.')