chore: doc for windows

Signed-off-by: Hanchin Hsieh <me@yuchanns.xyz>

Build.ps1

@@ -1,6 +1,6 @@
 param (
     [string]$Version = "luajit",
-    [string]$BuildFromSource = "true"
+    [string]$BuildFromSource = "false"
 )
 
 $Build = [System.Convert]::ToBoolean($BuildFromSource)

README.md

@@ -36,7 +36,7 @@ For building binary if you wish to build from source, then `cargo` is required.
   },
   -- if you want to build from source then do `make BUILD_FROM_SOURCE=true`
   build = "make",
-  -- build = "powershell -ExecutionPolicy Bypass -File Build.ps1" -- for windows
+  -- build = "powershell -ExecutionPolicy Bypass -File Build.ps1 -BuildFromSource false" -- for windows
   dependencies = {
     "stevearc/dressing.nvim",
     "nvim-lua/plenary.nvim",