message: Add 1944 to changelog
diff: * [#1894](https://github.com/wasmerio/wasmer/pull/1894) Added exports `wasmer::{CraneliftOptLevel, LLVMOptLevel}` to allow using `Cranelift::opt_level` and `LLVM::opt_level` directly via the `wasmer` crate
  ### Changed
  +* [#1944](https://github.com/wasmerio/wasmer/pull/1944) Require `WasmerEnv` to be `Send + Sync` even in dynamic functions.
  ### Fixed
  