TypeError: Bound must be a type.

While trying the example code, got this error:

`Got [<class 'httpx.Client'>, <class 'httpx.AsyncClient'>]`.

The code in question:
```python
from rule34 import Rule34

# Initialize the client
r34 = Rule34()

# Get a random post
random_post = r34.get_random_post()
print(random_post)

# Search for posts with specific tags
posts = r34.search("python")
print(posts)
``` 