message: Update changelog again, to move entry to new unreleased section since there's been a release.
diff: ## **[Unreleased]**
  - [#1092](https://github.com/wasmerio/wasmer/pull/1092) Add `get_utf8_string_with_nul` to `WasmPtr` to read nul-terminated strings from memory.
  +- [#1071](https://github.com/wasmerio/wasmer/pull/1071) Add support for non-trapping float-to-int conversions, enabled by default.
  ## 0.12.0 - 2019-12-18
  @@ -14,7 +15,6 @@ Special thanks to [@ethanfrey](https://github.com/ethanfrey), [@AdamSLevy](https
  - [#1060](https://github.com/wasmerio/wasmer/pull/1060) Test the capi with all the backends
  - [#1069](https://github.com/wasmerio/wasmer/pull/1069) Add function `get_memory_and_data` to `Ctx` to help prevent undefined behavior and mutable aliasing. It allows accessing memory while borrowing data mutably for the `Ctx` lifetime. This new function is now being used in `wasmer-wasi`.
  - [#1058](https://github.com/wasmerio/wasmer/pull/1058) Fix minor panic issue when `wasmer::compile_with` called with llvm backend.
  -- [#1071](https://github.com/wasmerio/wasmer/pull/1071) Add support for non-trapping float-to-int conversions, enabled by default.
  - [#858](https://github.com/wasmerio/wasmer/pull/858) Minor panic fix when wasmer binary with `loader` option run a module without exported `_start` function.
  - [#1056](https://github.com/wasmerio/wasmer/pull/1056) Improved `--invoke` args parsing (supporting `i32`, `i64`, `f32` and `f32`) in Wasmer CLI
  - [#1054](https://github.com/wasmerio/wasmer/pull/1054) Improve `--invoke` output in Wasmer CLI
  