Print warning if deprecated --include-python flag is given

install-scripts/install-safe-chain.ps1

@@ -3,7 +3,9 @@
 # Usage with "iex (iwr {url} -UseBasicParsing)" --> See README.md
 
 param(
-    [switch]$ci
+    [switch]$ci,
+    # Backwards compatibility: deprecated; warn and ignore if supplied
+    [switch]$includepython
 )
 
 $Version = $env:SAFE_CHAIN_VERSION  # Will be fetched from latest release if not set
@@ -119,6 +121,9 @@ function Install-SafeChain {
     if ($ci) {
         $installMsg += " in ci"
     }
+    if ($includepython) {
+        Write-Warn "-includepython is deprecated and ignored. Python ecosystem is now included by default."
+    }
 
     Write-Info $installMsg