fix(cypress): upgrade cypress and properly set base url (#879)

Author: chrisvfritz

Diff for: packages/@vue/cli-plugin-e2e-cypress/generator/template/test/e2e/specs/test.js

@@ -2,7 +2,7 @@
 
 describe('My First Test', () => {
   it('Visits the Kitchen Sink', () => {
-    cy.visit(Cypress.env('VUE_DEV_SERVER_URL'))
+    cy.visit('/')
     cy.contains('h1', 'Welcome to Your Vue.js <%- hasTS ? '+ TypeScript ' : '' %>App')
   })
 })

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

@@ -24,7 +24,7 @@ module.exports = (api, options) => {
 
       const cyArgs = [
         command, // open or run
-        '--env', `VUE_DEV_SERVER_URL=${url}`,
+        '--config', `baseUrl=${url}`,
         ...rawArgs
       ]
 

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

@@ -22,7 +22,7 @@
     "access": "public"
   },
   "dependencies": {
-    "cypress": "^1.4.1",
+    "cypress": "^2.0.3",
     "eslint-plugin-cypress": "^2.0.1"
   }
 }