Upgrade development dependencies.

Author: bardiharborow

lib/__tests__/index.js

@@ -1,20 +1,23 @@
-const babel = require('babel-core')
+const babel = require('@babel/core')
 const plugin = require('../index.js')
+
 const options = {
   presets: [
-    ["es2015", {
+    ["@babel/env", {
       "modules": false
     }]
   ],
-  plugins: [plugin]
+  plugins: [
+    plugin
+  ]
 }
 
-it('Imports stripped', () => {
+it('Module imports are stripped', () => {
   var example = `
     import fs from 'fs'
     import path from 'path'
   `
 
   const {code} = babel.transform(example, options)
   expect(code.length).toBe(0)
-})
+})