Config XML cannot contain comments

[miohtama]

The following ~/.pythontidy.xml throws traceback when plugin is being run.

<config>

  <!-- Don't break my lines -->
  <parm name="COL_LIMIT" value="int(1000)" />

  <!-- Some... stuff -->
  <parm name="SHEBANG" value="" />
  <parm name="PARENTHESIZE_TUPLE_DISPLAY" value="bool(False)" />
  <parm name="ADD_BLANK_LINES_AROUND_COMMENTS" value="bool(False)" />
  <parm name="ADD_BLANK_LINE_AFTER_DOC_STRING" value="bool(True)" />
  <parm name="MAX_SEPS_FUNC_DEF" value="int(99)" />
  <parm name="MAX_SEPS_FUNC_REF" value="int(99)" />

  <!-- Don't mess with docstrings -->
  <parm name="WRAP_DOC_STRINGS" value="bool(False)" />
  <parm name="NORMALIZE_DOC_STRINGS" value="bool(False)" />
</config>