修改端口，尝试fix ci失败时报的端口冲突问题 review by songym

Author: zhushusun

examples-test/nightwatch.json

@@ -13,7 +13,7 @@
     "server_path": "./node_modules/selenium-server/lib/runner/selenium-server-standalone-2.53.1.jar",
     "log_path": false,
     "host": "127.0.0.1",
-    "port": 4444,
+    "port": 4445,
     "cli_args": {
       "webdriver.chrome.driver": "./node_modules/chromedriver/lib/chromedriver/chromedriver.exe"
     }
@@ -22,7 +22,7 @@
   "test_settings": {
     "default": {
       "launch_url": "http://localhost",
-      "selenium_port": 4444,
+      "selenium_port": 4445,
       "selenium_host": "localhost",
       "silent": true,
       "screenshots": {