Bug fix to allow the script to be run from outside psy-simple

setup.py

@@ -3,9 +3,14 @@
 from setuptools.command.test import test as TestCommand
 import sys
 
+setup_dir = osp.dirname(__file__)
+
+# is set down below
+__version__ = None
+
 
 def readme():
-    with open('README.rst') as f:
+    with open(osp.join(setup_dir, 'README.rst')) as f:
         return f.read()
 
 
@@ -25,7 +30,7 @@ def run_tests(self):
 
 
 # read the version from version.py
-with open(osp.join('psy_simple', 'version.py')) as f:
+with open(osp.join(setup_dir, 'psy_simple', 'version.py')) as f:
     exec(f.read())