fix: added support for wav files using urls

instructor/multimodal.py

@@ -4,6 +4,7 @@
 from pathlib import Path
 from pydantic import BaseModel, Field
 from .mode import Mode
+import requests
 
 
 class Image(BaseModel):
@@ -90,7 +91,10 @@ class Audio(BaseModel):
  def from_url(cls, url: str) -> Audio:
  """Create an Audio instance from a URL."""
  assert url.endswith(".wav"), "Audio must be in WAV format"
- return cls(source=url, data=None)
+
+ response = requests.get(url)
+ data = base64.b64encode(response.content).decode("utf-8")
+ return cls(source=url, data=data)
 
  @classmethod
  def from_path(cls, path: str | Path) -> Audio: