Update README.md

README.md

@@ -12,7 +12,7 @@ facilitates building modular, composable structs while allowing access to
 solvers and optimisers that require flat lists of parameters. Importantly it's
 type-stable and _very_ fast. It is not intended for use with arrays, as we do
 not know their length at compile time. But you can easily splat the output Tuple
-int a vector.
+into a vector.
 
 Flatten is also flexible. The types to return and ignore can be specified, and
 individual fields can be ignored using field-level traits like `flattenable`