Fix PROXY header handling to prevent panic on missing source address - #66
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Fixes a parsing issue for PROXY header handling leading to a panic
'PROXY TCP4\r\n' -> 'bytes.Split' -> ["PROXY","TCP4"], after 'params = params[1:]' → ["TCP4"] (len 1).
The check'len(params) < 1' not working; 'case "TCP4": params[1]' -> index out of range -> panic