change_asset_symbol.py:  Fix permissions
change_asset_symbol.py:  Fix permissions

pmconrad/graphene,oxarbitrage/bitshares-core,bigoc/openchain,bitshares/bitshares-2,pmconrad/graphene,pmconrad/graphene,oxarbitrage/bitshares-core,peertracksinc/muse,pmconrad/graphene,peertracksinc/muse,peertracksinc/muse,bigoc/openchain,bitsuperlab/cpp-play2,abitmore/bitshares-2,oxarbitrage/bitshares-core,cryptonomex/graphene,cryptonomex/graphene,abitmore/bitshares-2,bitshares/bitshares-2,bigoc/openchain,bitsuperlab/cpp-play2,abitmore/bitshares-2,peertracksinc/muse,abitmore/bitshares-2,bigoc/openchain,bitshares/bitshares-2,bitshares/bitshares-2,bitsuperlab/cpp-play2,oxarbitrage/bitshares-core,cryptonomex/graphene