Add conditional function declaration

HC05.begin() was not declared for the case when software serial is not selected. In that case it did not even compile in spite of the fact that the definition was available.

I just added it conditionally.

HC05.h

@@ -93,6 +93,9 @@ class HC05 : public Stream
 #endif
     virtual int available(void);
     virtual void begin(unsigned long);
+#ifndef HC05_SOFTWARE_SERIAL
+	virtual void begin(unsigned long, uint8_t);
+#endif
     virtual int peek(void);
     virtual int read(void);
     virtual void flush(void);