Adding serial.set(Rx|Tx)BufferSize (#1931)

* Fix for https://github.com/Microsoft/pxt-microbit/issues/1929

* bump pxt

* updated docs

* fix default values

* moving dialogs to react

* moving to react

* typo

* typo

package.json

@@ -35,6 +35,9 @@
     "typescript": "2.6.1",
     "less": "2.7.3",
     "semantic-ui-less": "2.2.14",
+    "react": "16.3.1",
+    "@types/react": "16.0.25",
+    "@types/react-dom": "16.0.3",
     "@types/bluebird": "2.0.33",
     "@types/jquery": "3.2.16",
     "@types/marked": "0.3.0",
@@ -42,7 +45,7 @@
     "@types/web-bluetooth": "0.0.4"
   },
   "dependencies": {
-    "pxt-common-packages": "6.5.3",
-    "pxt-core": "5.5.24"
+    "pxt-common-packages": "6.5.14",
+    "pxt-core": "5.5.37"
   }
 }