Up to date random UA via real world browser usage statistic

[LeMoussel]

I think the list of user agents is too small (USER_AGENT_LIST).

In other projects, I use (successfully) this library: fake-user agent. Up to date simple useragent faker with real world database.

In utils.py, get_rand_user_agent() maybe like this :

from fake_useragent import UserAgent

def get_rand_user_agent():
   ua = UserAgent()
   # Return random UA via real world browser usage statistic
   return ua.random

[deven96]

Would you mind opening a PR to effect this? @LeMoussel