fix(e2e-cypress): make --headless work with --browser chrome (#5108)

* fix(e2e-cypress): make —headless work with —browser chrome

fix #5103

* fix: increase cypress minimum version to 3.8

this version onwards supports using --browser chrome --headless

Author: LinusBorg

packages/@vue/cli-plugin-e2e-cypress/index.js

@@ -14,7 +14,6 @@ module.exports = (api, options) => {
       `All Cypress CLI options are also supported:\n` +
       chalk.yellow(`https://docs.cypress.io/guides/guides/command-line.html#cypress-run`)
   }, async (args, rawArgs) => {
-    removeArg(rawArgs, 'headless', 0)
     removeArg(rawArgs, 'mode')
     removeArg(rawArgs, 'url')
     removeArg(rawArgs, 'config')

packages/@vue/cli-plugin-e2e-cypress/package.json

@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "@vue/cli-shared-utils": "^4.1.2",
-    "cypress": "^3.3.1",
+    "cypress": "^3.8.0",
     "eslint-plugin-cypress": "^2.7.0"
   },
   "peerDependencies": {