Fixed deprecation warning.

Author: jfjlaros

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = arduino-simple-rpc
-version = 2.0.1
+version = 2.0.2
 description = Arduino simpleRPC API client library and CLI.
 long_description = file: README.rst
 author = Jeroen F.J. Laros

simple_rpc/__init__.py

@@ -6,7 +6,8 @@
 
 
 config = ConfigParser()
-config.read_file(open('{}/setup.cfg'.format(dirname(abspath(__file__)))))
+with open('{}/setup.cfg'.format(dirname(abspath(__file__)))) as handle:
+    config.read_file(handle)
 
 _copyright_notice = 'Copyright (c) {} {} <{}>'.format(
     config.get('metadata', 'copyright'),