Update Adafruit core to v1.7.0

Resolves #209

Author: valeros

platform.json

@@ -54,7 +54,7 @@
       "type": "framework",
       "optional": true,
       "owner": "platformio",
-      "version": "~1.10601.0"
+      "version": "~1.10700.0"
     },
     "framework-arduinonordicnrf5": {
       "type": "framework",