fix: push header before limit check in get_headers_response
#318
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This PR is a robustness fix that pushes the header to result before checking the next header in
get_headers_response. Previously, when hitting a limit, one valid header was omitted from the response.The spec: https://github.com/ethereum/devp2p/blob/40ab248bf7e017e83cc9812a4e048446709623e8/caps/eth.md#blockheaders-0x04