Update README.md

Author: ablaom

README.md

@@ -24,7 +24,7 @@ Here `learner` specifies the configuration the algorithm (the hyperparameters) w
 `model` stores learned parameters and any byproducts of algorithm execution.
 
 LearnAPI.jl is mostly method stubs and lots of documentation. It does not provide
-meta-algorithms, such as cross-validation or hyperparameter optimization, but does aim to
+meta-algorithms, such as cross-validation, hyperparameter optimization, or model composition, but does aim to
 support such algorithms.
 
 ## Related packages