fix typo in setup.py, referring to sqlwhat...

Author: machow

setup.py

@@ -6,7 +6,7 @@
 
 _version_re = re.compile(r'__version__\s+=\s+(.*)')
 
-with open('sqlwhat/__init__.py', 'rb') as f:
+with open('pythonwhat/__init__.py', 'rb') as f:
     version = str(ast.literal_eval(_version_re.search(
         f.read().decode('utf-8')).group(1)))