fix: error invalid arg type on WSL systems on url open

lib/index.js

@@ -36,7 +36,7 @@
     reject(Object.assign(er, resultError))
   }
 
-  const proc = spawn(cmd, args, opts)
+  const proc = spawn(cmd, args, { ...opts, shell: true })
   promise.stdin = proc.stdin
   promise.process = proc
 
@@ -141,7 +141,7 @@
     if (platform === 'win32') {
       // spawnWithShell does not do the additional os.release() check, so we
       // have to force the shell here to make sure we treat WSL as windows.
-      options.shell = process.env.ComSpec
+      options.shell = process.env.ComSpec || 'cmd.exe'
       // also, the start command accepts a title so to make sure that we don't
       // accidentally interpret the first arg as the title, we stick an empty
       // string immediately after the start command