Fix invocation python2 -> python3

Change-Id: Ic78da9c03e99f59d142c93394051bbc2751f0205
diff --git a/contrib/jenkins.sh b/contrib/jenkins.sh
index a70f139..5ba2c8d 100755
--- a/contrib/jenkins.sh
+++ b/contrib/jenkins.sh
@@ -9,7 +9,7 @@
 	exit 1
 fi
 
-virtualenv -p python2 venv --system-site-packages
+virtualenv -p python3 venv --system-site-packages
 . venv/bin/activate
 pip install pytlv
 pip install pyyaml
diff --git a/pySim-prog.py b/pySim-prog.py
index 8547573..0f752fb 100755
--- a/pySim-prog.py
+++ b/pySim-prog.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 
 #
 # Utility to deal with sim cards and program the 'magic' ones easily
diff --git a/pySim-read.py b/pySim-read.py
index 3e19a02..6608556 100755
--- a/pySim-read.py
+++ b/pySim-read.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 
 #
 # Utility to display some informations about a SIM card
diff --git a/pySim/card_handler.py b/pySim/card_handler.py
index bb33833..eaa838b 100644
--- a/pySim/card_handler.py
+++ b/pySim/card_handler.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 
 """ pySim: card handler utilities