Finish up cache and fix tests.

Still TODO: Merge with ignore functionality.

setup.py

@@ -22,14 +22,13 @@ PROJECT_DIR = path.abspath(path.dirname(__file__))
 
 def get_version():
     constants = path.join(PROJECT_DIR, 'django_migration_linter', 'constants.py')
-    _version_re = re.compile(r"__VERSION__\s+=\s+(?P<version>.*)")
+    _version_re = re.compile(r"__version__\s+=\s+(?P<version>.*)")
     with open(constants, "r") as f:
         match = _version_re.search(f.read())
         version = match.group("version") if match is not None else '"unknown"'
     return str(ast.literal_eval(version))
 
 
-
 with open(path.join(PROJECT_DIR, 'README.rst')) as f:
     long_description = f.read()