setup.py: fix package name

The package providing the serial python module seems to be called
pyserial, which also matches what's written in requirements.txt.

Change-Id: I71ef6a19a487101e552219f10f2fa6215b966abd
diff --git a/setup.py b/setup.py
index f776443..620e246 100644
--- a/setup.py
+++ b/setup.py
@@ -10,7 +10,7 @@
     description='Tools related to SIM/USIM/ISIM cards',
     install_requires=[
         "pyscard",
-        "serial",
+        "pyserial",
         "pytlv",
         "cmd2 >= 1.5.0",
         "jsonpath-ng",