rename hid_init() to hidapi_hid_init() to avoid collision with usbhid

Index: README.md
--- README.md.orig
+++ README.md
@@ -112,7 +112,7 @@ int main(int argc, char* argv[])
 	int i;
 
 	// Initialize the hidapi library
-	res = hid_init();
+	res = hidapi_hid_init();
 
 	// Open the device using the VID, PID,
 	// and optionally the Serial number.