kvdb 0.3 build error

[litecreator]

error[E0277]: the trait bound `smallvec::SmallVec<[u8; 32]>: MallocSizeOf` is not satisfied
   --> tetsy-kvdb-rocksdb/src/lib.rs:261:10
    |
261 | #[derive(MallocSizeOf)]
    |          ^^^^^^^^^^^^ expected an implementor of trait `MallocSizeOf`
    |
    = note: required because of the requirements on the impl of `MallocSizeOf` for `HashMap<smallvec::SmallVec<[u8; 32]>, KeyState>`
    = note: 2 redundant requirements hidden
    = note: required because of the requirements on the impl of `MallocSizeOf` for `parking_lot::lock_api::RwLock<parking_lot::RawRwLock, Vec<HashMap<smallvec::SmallVec<[u8; 32]>, KeyState>>>`
    = note: required by `tetsy_util_mem::MallocSizeOf::size_of`
    = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)