Upgrade MinGW role to install 10.2.0

Remove unused parameters and print more meaningful message.

minicoin/roles/mingw/provision.ps1

 param (
-    [string]$role,
-    [string]$name,
-    [string]$user,
-    [string]$version = "8.1.0",
+    [string]$version = "10.2.0",
     [string]$package = "mingw"
 )
 
-write-host $role $name $user $package $version
+write-host "Installing ${package} version ${version}"
 
 cd "$($env:SystemDrive)\ProgramData\Chocolatey\bin"