fix: SublimeText 2 / 3 load of util

util was not loading with the following error:

Writing file /C/Users/Parity/AppData/Roaming/Sublime Text 2/Packages/OpenSearchResult/open_search_result.py with encoding UTF-8
Reloading plugin C:\Users\Parity\AppData\Roaming\Sublime Text 2\Packages\OpenSearchResult\open_search_result.py
Traceback (most recent call last):
  File ".\sublime_plugin.py", line 62, in reload_plugin
    m = imp.load_module(modulename, *m_info)
  File ".\open_search_result.py", line 3, in <module>
    from .util import parse_line_number, is_file_path
ValueError: Attempted relative import in non-package