update script: find first .crx file in github releases

update.py

@@ -18,7 +18,10 @@ for ext in exts:
     if ext["updateMethod"] == "github":
         with urlopen(ext["updateUrl"]) as r:
             latest = json.load(r)[0]
-            ext["url"] = latest["assets"][0]["browser_download_url"]
+            for asset in latest["assets"]:
+                if asset["browser_download_url"].endswith(".crx"):
+                    ext["url"] = asset["browser_download_url"]
+                    break
             with urlopen(ext["url"]) as blob:
                 sha256 = hashlib.new("SHA256")
                 if blob.status == 200: