Fixes #181 (drop Python 3.3).

gns3server/run.py

@@ -199,9 +199,9 @@ def run():
     if server_config.getboolean("local"):
         log.warning("Local mode is enabled. Beware, clients will have full control on your filesystem")
 
-    # we only support Python 3 version >= 3.3
-    if sys.version_info < (3, 3):
-        raise RuntimeError("Python 3.3 or higher is required")
+    # we only support Python 3 version >= 3.4
+    if sys.version_info < (3, 4):
+        raise RuntimeError("Python 3.4 or higher is required")
 
     user_log.info("Running with Python {major}.{minor}.{micro} and has PID {pid}".format(
                   major=sys.version_info[0], minor=sys.version_info[1],