Merge pull request lnbook#78 from mulles/patch-1

Update ch01.asciidoc

ch01.asciidoc

@@ -63,7 +63,7 @@ You can watch a video explaining the construction and operation of unidirectiona
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 Surprisingly both properties took quite some while until the community figured them out.
-Technically speaking the unidirectional payment channel has all the important ingreedients (funding transaction to a 2-2 multisignature wallet, a transaction spending from the wallet encoding the balance, a timelock to allow refunding if the other side becomes unresponsive, off chain communication and the fact that no additional trust other than the one in the bitcoin network) of modern payment channels which are used in the LN.
+Technically speaking the unidirectional payment channel has all the important ingredients (funding transaction to a 2-2 multisignature wallet, a transaction spending from the wallet encoding the balance, a timelock to allow refunding if the other side becomes unresponsive, off chain communication and the fact that no additional trust other than the one in the bitcoin network) of modern payment channels which are used in the LN.
 Despite being rather useless in today's world we will study the unidirectional payment channel in more depth in this book as it is an easy to understand educational example to approach the construction of today's payment channels.
 This setup has one safety issue as transactions have been malleable without the segwit upgrade.
 A problem that needed to be solved for any payment channel construction that we know up till today and which has been fixed in August 2017.