message: Import Target via wasmer
diff: use std::sync::Arc;
  use wasmer::{
  imports, wat2wasm, Instance, Memory, MemoryError, MemoryType, Module, Pages, Store, TableType,
  - Tunables as BaseTunables,
  + Target, Tunables as BaseTunables,
  };
  -use wasmer_compiler::Target;
  use wasmer_compiler_cranelift::Cranelift;
  use wasmer_engine::Tunables;
  use wasmer_engine_jit::JIT;
  