Update Arduino maple core // Resolve #446

Author: valeros

boards/disco_f407vg.json

@@ -2,7 +2,7 @@
   "build": {
     "core": "stm32",
     "cpu": "cortex-m4",
-    "extra_flags": "-DSTM32F4 -DSTM32F407xx -DSTM32F40_41xxx -DARDUINO_STM32DiscoveryF407 -DBOARD_discovery_f4",
+    "extra_flags": "-DSTM32F4",
     "f_cpu": "168000000L",
     "mcu": "stm32f407vgt6",
     "variant": "DISCO_F407VG",

platform.json

@@ -188,7 +188,7 @@
       "type": "framework",
       "optional": true,
       "owner": "platformio",
-      "version": "~2.10000.0"
+      "version": "~3.10000.0"
     },
     "framework-arduinostm32mxchip": {
       "type": "framework",