Use read_binary function of card class to read GID2 and reduce code duplication

Change-Id: I5d80fcc1446a6691b8e2a09bcec558148fa31ab2
diff --git a/pySim-read.py b/pySim-read.py
index cd82498..f167bce 100755
--- a/pySim-read.py
+++ b/pySim-read.py
@@ -124,7 +124,7 @@
 
 	# EF.GID2
 	try:
-		(res, sw) = card.read_gid2()
+		(res, sw) = card.read_binary('GID2')
 		if sw == '9000':
 			print("GID2: %s" % (res,))
 		else: