fix: move rollup config and case fix

package.json

@@ -5,7 +5,7 @@
   "author": "Declan de Wet <declandewet@me.com>",
   "bugs": "https://github.com/nuxt/vue-meta/issues",
   "scripts": {
-    "build": "rimraf lib && rollup -c",
+    "build": "rimraf lib && rollup -c scripts/rollup.config.js",
     "codecov": "codecov",
     "deploy": "npm version",
     "dev": "cd examples && npm run dev && cd ..",

scripts/rollup.config.js

@@ -1,4 +1,4 @@
-import commonJs from 'rollup-plugin-commonjs'
+import commonjs from 'rollup-plugin-commonjs'
 import nodeResolve from 'rollup-plugin-node-resolve'
 import json from 'rollup-plugin-json'
 import buble from 'rollup-plugin-buble'
@@ -25,7 +25,7 @@ const baseConfig = {
   plugins: [
     json(),
     nodeResolve(),
-    commonJs(),
+    commonjs(),
     buble(),
   ]
 }