Updated README unparse example with pretty=True.
Updated README unparse example with pretty=True.

butson/xmltodict,sporgj/xmltodict,pombredanne/xmltodict,ahlusar1989/xmltodict,martinblech/xmltodict,solvebio/xmltodict,CyberTailor/iBlock,CyberTailor/iBlock,lucius-feng/xmltodict,bzamecnik/xmltodict,haiyangd/xmltodict,martinblech/xmltodict,pombredanne/xmltodict