Merge pull request #307 from Googolplexed0/patch-1

Accept Incorrectly Capitalized Content-Range Headers as Backup

Author: kokarare1212

librespot/audio/__init__.py

@@ -578,6 +578,8 @@ def __init__(self, session: Session, stream_id: StreamId,
             response = self.request(range_start=0,
                                     range_end=ChannelManager.chunk_size - 1)
             content_range = response.headers.get("Content-Range")
+            if content_range is None:
+                content_range = response.headers.get("content-range")
             if content_range is None:
                 raise IOError("Missing Content-Range header!")
             split = content_range.split("/")