transfer encoding header value in exception instead

Author: brentru

adafruit_requests.py

@@ -227,7 +227,7 @@ def request(method, url, data=None, json=None, headers=None, stream=False, timeo
         resp.headers = parse_headers(sock)
         if resp.headers.get("transfer-encoding"):
             if "chunked" in resp.headers.get("transfer-encoding"):
-                raise ValueError("Unsupported " + str(line[0]))
+                raise ValueError("Unsupported " + resp.headers.get("transfer-encoding"))
         elif resp.headers.get("location") and not 200 <= status <= 299:
             raise NotImplementedError("Redirects not yet supported")