Update README.md

We no longer use CBOR for serialization

plutus-core/README.md

@@ -8,7 +8,7 @@ The Haskell package `plutus-core` implements a range of functionality for manipu
 
 * Parser and pretty-printer for textual Plutus Core representation as per the Plutus Core specification
 
-* Binary serialisation and deserialisation using the `cborg` package (coordinate with Duncan)
+* Binary serialisation and deserialisation using the `flat` package
 
 * Plutus Core abstract syntax
 
@@ -90,4 +90,4 @@ There is an executable that runs programs on the CK machine: you can feed a prog
 
 #### The CEK machine
 
-Similarly for untyped plutus core, the CEK machine can be used to evaluate untyped plutus core programs. Run `cabal run uplc evaluate -- -h` for a full list of options.
+Similarly for untyped plutus core, the CEK machine can be used to evaluate untyped plutus core programs. Run `cabal run uplc evaluate -- -h` for a full list of options.