pi-calculus-0.0.5: changes.md

Version 0.0.5:
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Changelog!

- Fixed an issue with pattern matching on lists. Lists of the same length pattern match exactly: i.e.
let list(a,b,c) = list(1,2,3) => a = 1 , b = 2, c = 3 . 

- Added the primitive append(list(a..),list(b..)) => list(a..,b..)