[req-change] Use --headless

Author: pandafy

openwisp_utils/tests/selenium.py

@@ -82,7 +82,7 @@ def get_chrome_webdriver(cls):
         options = webdriver.ChromeOptions()
         options.page_load_strategy = 'eager'
         if os.environ.get('SELENIUM_HEADLESS', False):
-            options.add_argument('--headless=new')
+            options.add_argument('--headless')
         CHROME_BIN = os.environ.get('CHROME_BIN', None)
         if CHROME_BIN:
             options.binary_location = CHROME_BIN