<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def read_relative_file(filename):
 """ Return the contents of the given file. Its path is supposed relative to this module. """

    path = join(dirname(abspath(__file__)), filename)
    with io.open(path, encoding='utf-8') as f:
        return f.read()