Update TheThingsNetwork.h

A new function to wake up the module from sleep

Author: alexbn71

src/TheThingsNetwork.h

@@ -93,6 +93,7 @@ class TheThingsNetwork
   ttn_response_t poll(port_t port = 1, bool confirm = false);
   void sleep(uint32_t mseconds);
   void saveState();
+  void wake();
 };
 
 #endif