Make README a bit more useful

parrot · Jan 13, 2011 · e6fcac4 · e6fcac4
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-tree-optimization : A library for Parrot Virtual machine for tree optimization
+tree-optimization : A Parrot VM library for analysis, pattern-matching and transformation of trees
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+This library mainly focuses on PAST (Parrot Abstract Syntax Tree) and POST (Parrot Opcode Syntax Tree) trees.