update .xml to application/xml

Author: skyfox675

src/mime.json

@@ -1125,7 +1125,7 @@
 	".xltx": "application/vnd.openxmlformats-officedocument.spreadsheetml.template",
 	".xlw": "application/vnd.ms-excel",
 	".xm": "audio/xm",
-	".xml": "text/xml",
+	".xml": "application/xml",
 	".xns": "application/xcap-ns+xml",
 	".xo": "application/vnd.olpc-sugar",
 	".xop": "application/xop+xml",