Allow users to request a specific version when installing

[Michael-F-Bryan]

This action will always install the latest stable build, however sometimes you want to use a specific version (e.g. v3.0.0-rc.2 because v2.3.0 is missing features you want).

It'd be nice if users were able to set the version number being used, falling back to the latest stable when not provided.

Maybe something like this:

- name: Setup Wasmer
  uses: wasmerio/setup-wasmer@v1
  with:
    version: "3.0.0-rc.2"

[dynamite-bud]

Closed in #3 .
Wasmer version was specified in setup wasmer. So that only the specified version is installed