[FIX] smile_upgrade: fix DeprecationWarning

DeprecationWarning: This method will be removed in future versions.  Use 'parser.read_file()' instead.

smile_upgrade/models/config.py

@@ -50,7 +50,7 @@ def load(self):
             return
         config = ConfigParser()
         try:
-            config.readfp(open(config_file))
+            config.read_file(open(config_file))
             for (key, value) in config.items('options'):
                 if value in ('True', 'False'):
                     value = safe_eval(value)