Update pxt.json

Author: RoboraceMSW

pxt.json

@@ -16,16 +16,12 @@
         "test.ts"
     ],
     "targetVersions": {
-        "target": "8.0.16",
+        "target": "8.0.17",
         "targetId": "microbit"
     },
     "supportedTargets": [
         "microbit"
     ],
     "preferredEditor": "blocksprj",
-    "locales": [
-        "en",
-        "nl"
-    ],
     "public": true
 }