fixed version issue with manual packer plugins install from local path

[7ep3s]

The plugin doesn't report its version so packer plugins install -path packer-plugin-wim_windows_amd64.exe "github.com/marmold/wim" will error out.

PS C:\temp> packer plugins install -path .\packer-plugin-wim_windows_amd64.exe "github.com/marmold/wim"
Error: Invalid version
Plugin's reported version ("") is not semver-compatible: Malformed version:

See below:

PS C:\temp> .\packer-plugin-wim_windows_amd64.exe describe
{"version":"","sdk_version":"0.2.3","api_version":"x5.0","builders":[],"post_processors":["-packer-default-plugin-name-"],"provisioners":[],"datasources":[]}

Fixed by implementing the version package from packer-plugin-sdk.