Grammar fix
@@ -6,7 +6,7 @@ This allocator is used as the default Redox.
## A note on its state.
-It fully works, although it is somewhat slower than jemalloc, since it haven't
+It fully works, although it is somewhat slower than jemalloc, since it hasn't
been optimized yet.
I consider the state of the code quality very good.
Jeremy Soller