Added SARA R4 to client

src/TinyGsmClient.h

@@ -48,6 +48,14 @@
   typedef TinyGsmUBLOX::GsmClient TinyGsmClient;
   typedef TinyGsmUBLOX::GsmClientSecure TinyGsmClientSecure;
 
+#elif defined(TINY_GSM_MODEM_SARAR4)
+  #define TINY_GSM_MODEM_HAS_GPRS
+  #define TINY_GSM_MODEM_HAS_SSL
+  #include <TinyGsmClientSaraR4.h>
+  typedef TinyGsmUBLOX TinyGsm;
+  typedef TinyGsmSaraR4::GsmClient TinyGsmClient;
+  typedef TinyGsmSaraR4::GsmClientSecure TinyGsmClientSecure;
+
 #elif defined(TINY_GSM_MODEM_M95)
   #define TINY_GSM_MODEM_HAS_GPRS
   #include <TinyGsmClientM95.h>