input: Write a python function to count the number of tweets containing a specific hashtag.
  assert get_tweets_count('#python')['count'] >= 0
  assert get_tweets_count('#coding')['count'] >= 0
  assert get_tweets_count('#opensource')['count'] >= 0
output: def get_tweets_count(hashtag):
      import tweepy
      
      # You need to replace these with your own credentials
      consumer_key = 'your_consumer_key'
      consumer_secret = 'your_consumer_secret'
      access_token = 'your_access_token'
      access_token_secret = 'your_access_token_secret'
      
      # Authenticate with the Twitter API
      auth = tweepy.OAuth1UserHandler(consumer_key, consumer_secret, access_token, access_token_secret)
      api = tweepy.API(auth)
      
      # Search for the hashtag
      tweets = api.search_tweets(q=hashtag, count=100)
      
      # Return the count of tweets
      return {'count': len(tweets)}