Merge pull request #1 from jiangfuzhi/master

updated pxt.json

Author: jiangfuzhi

pxt.json

@@ -15,5 +15,9 @@
     "testFiles": [
         "test.ts"
     ],
-    "public": true
+    "public": true,
+    "supportedTargets": [
+        "microbit"
+    ],
+    "preferredEditor": "tsprj"
 }