Make getHostByName take const char* for consistency with underlying CC3k API.

Author: tdicola

Adafruit_CC3000.cpp

@@ -1195,7 +1195,7 @@ uint16_t Adafruit_CC3000::ping(uint32_t ip, uint8_t attempts, uint16_t timeout,
 #endif
 
 #ifndef CC3000_TINY_DRIVER
-uint16_t Adafruit_CC3000::getHostByName(char *hostname, uint32_t *ip) {
+uint16_t Adafruit_CC3000::getHostByName(const char *hostname, uint32_t *ip) {
   if (!_initialised) return 0;
   if (!cc3000Bitset.test(CC3000BitSet::IsConnected)) return 0;
   if (!cc3000Bitset.test(CC3000BitSet::HasDHCP)) return 0;

Adafruit_CC3000.h

@@ -176,7 +176,7 @@ class Adafruit_CC3000 {
 
 
     uint16_t ping(uint32_t ip, uint8_t attempts=3,  uint16_t timeout=500, uint8_t size=32);
-    uint16_t getHostByName(char *hostname, uint32_t *ip);
+    uint16_t getHostByName(const char *hostname, uint32_t *ip);
     #endif
 
     /* Functions that aren't available with the tiny driver */