doc(changelog) Add wasmerio#915, wasmerio#917 and wasmerio#925.

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## **[Unreleased]**
 
+- [#925](https://github.com/wasmerio/wasmer/pull/925) Host functions can be closures with a captured environment.
+- [#917](https://github.com/wasmerio/wasmer/pull/917) Host functions (aka imported functions) may not have `&mut vm::Ctx` as first argument, i.e. the presence of the `&mut vm::Ctx` argument is optional.
+- [#915](https://github.com/wasmerio/wasmer/pull/915) All backends share the same definition of `Trampoline` (defined in `wasmer-runtime-core`).
 - [#921](https://github.com/wasmerio/wasmer/pull/921) In LLVM backend, annotate all memory accesses with TBAA metadata.
 - [#883](https://github.com/wasmerio/wasmer/pull/883) Allow floating point operations to have arbitrary inputs, even including SNaNs.
 - [#856](https://github.com/wasmerio/wasmer/pull/856) Expose methods in the runtime C API to get a WASI import object