add no-cache headers (#133)

* add no-cache headers

* Fix cache control

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Co-authored-by: FabioRosado <hello@fabiorosado.dev>

Author: madhur-tandon

src/pyscript/plugins/run.py

@@ -34,6 +34,7 @@ def end_headers(self):
             self.send_header("Cross-Origin-Opener-Policy", "same-origin")
             self.send_header("Cross-Origin-Embedder-Policy", "require-corp")
             self.send_header("Cross-Origin-Resource-Policy", "cross-origin")
+            self.send_header("Cache-Control", "no-cache, must-revalidate")
             SimpleHTTPRequestHandler.end_headers(self)
 
     return FolderBasedHTTPRequestHandler