chore(scripts): remove useless requires (#219)

scripts/build.js

@@ -16,7 +16,6 @@ yarn build core --formats cjs
 
 const fs = require('fs-extra')
 const path = require('path')
-const zlib = require('zlib')
 const chalk = require('chalk')
 const execa = require('execa')
 const { gzipSync } = require('zlib')

scripts/dev.js

@@ -17,8 +17,7 @@ __DEV__=false yarn dev
 */
 
 const execa = require('execa')
-const { targets, fuzzyMatchTarget } = require('./utils')
-
+const { fuzzyMatchTarget } = require('./utils')
 const args = require('minimist')(process.argv.slice(2))
 const target = args._.length ? fuzzyMatchTarget(args._)[0] : 'vue'
 const formats = args.formats || args.f