title: Filter tweets using "filter_level" in Twitter streaming API
body: <p>I am using statuses/filter and am trying to filter the tweets from the twitter stream based on the parameter "filter_level". </p>
  
  <pre><code>query = ["Donald Trump","Cristiano Ronaldo"]
  
  numberOfTweets = 1000
  dictOfTweets ={}
  twitter_api = oauth_login()
  twitter_stream = twitter.TwitterStream(auth=twitter_api.auth)
  
  for q in query:
    stream =  twitter_stream.statuses.filter(track=q,max_count=numberOfTweets,languages= ['en'],filter_level=['medium'])
    for tweet in stream:
        if tweet.get('text',0) == 0:
            continue
        dictOfTweets.setdefault(q,[]).append(tweet['text'])
  </code></pre>
  
  <p>I am still getting tweets with filter_level ="low". It would be really helpful if anyone can suggest what am I missing or doing wrong?</p>