bug in segwit transaction

[DariusParvin]

Thank you for this awesome tutorial!

I ran the code to create a transaction, but I get an error message when I try to decode it.
specifically with bitcoind 'decoderawtransaction' i get error code: -22. I tried with other decoders too.

Here's an example transaction that's generated with the code:
010000000001014fd41d549a05ecb69351b91c4d4095984f0bb458e75046a75f7daf91c0fec97301000000171600143eccb863aa870995519e89f242fcaadcf526a34dffffffff01d0fb01000000000017a91487b16bf5c5e43bf1dbd69440556f4f5a1430b5fd87024730450221008ad3c641868acf26bcdeabbf3bfa3cb0a1688938ce01886eb0c4ae712d926c300220799b8da8e3bed0c542abe7b5797173a9e44a51875c16890adb2d2d0776c906fa01210337078f8c4a54b67cd1724a3535cb1918bca186c7a143459c9aac35113d4a958b00000000

[DariusParvin]

I found it. The length of the signature in the witness field should be "len(signature)+1", as stated in the readme tutorial.