Merge branch 'merge' of https://github.com/ylzh10/vm-allocator into merge

Author: ylzh10

CHANGELOG.md

@@ -4,8 +4,8 @@
 
 ### Added
 
-- Added `available()` API in `AddressAllocator` to allow
-  getting the available memories after `allocate/free()`s
+- Added `used()` API in `AddressAllocator` to allow
+  getting the used memories after `allocate/free()`s
 
 ### Changed
 ### Fixed