Update Arduino core to v1.1.0

Resolves #22

Author: valeros

Diff for: platform.json

@@ -46,13 +46,13 @@
       "type": "framework",
       "optional": true,
       "owner": "platformio",
-      "version": "~1.0.5"
+      "version": "~1.1.0"
     },
     "framework-arduinorenesas-portenta": {
       "type": "framework",
       "optional": true,
       "owner": "platformio",
-      "version": "~1.0.5"
+      "version": "~1.1.0"
     },
     "framework-renesas-fsp": {
       "type": "framework",