Use raw strings for regexes (django-webpack#154)

Author: matthiask

webpack_loader/config.py

@@ -14,7 +14,7 @@
  # FIXME: Explore usage of fsnotify
  'POLL_INTERVAL': 0.1,
  'TIMEOUT': None,
- 'IGNORE': ['.+\.hot-update.js', '.+\.map']
+ 'IGNORE': [r'.+\.hot-update.js', r'.+\.map']
  }
 }