fix markdown

README.md

@@ -97,13 +97,15 @@ Tasks:
 ### Milestone 5 - Full consensus validation
 
 Validate full block execution over large number of blocks, including the Bitcoin scripts checks and Utreexo proofs.
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 * [x] consensus logic
 * [ ] consensus logic + utreexo proofs  
 * [ ] consensus logic + utreexo proofs + scripts
 
 ### Milestone 6 - Proving
 
 Recursively verify STARK proofs of chain state updates. Still largely tbd. From initial observations it is clear that a series of optimizations will be necessary.
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 * [ ] sha256 optimization
 * [ ] don't use ByteArray when serializing data
 * [ ] blocklevel recursion