update COPYRIGHT_YEAR (#851)
update COPYRIGHT_YEAR (#851)

61e6559 update COPYRIGHT_YEAR
ArgonToken/ArgonToken,ArgonToken/ArgonToken,cerebrus29301/crowncoin,ArgonToken/ArgonToken,xuyangcn/opalcoin,cerebrus29301/crowncoin,ahmedbodi/test2,xuyangcn/opalcoin,ahmedbodi/test2,ArgonToken/ArgonToken,grumpydevelop/singularity,cerebrus29301/crowncoin,grumpydevelop/singularity,cerebrus29301/crowncoin,ahmedbodi/test2,grumpydevelop/singularity,ahmedbodi/test2,xuyangcn/opalcoin,cerebrus29301/crowncoin,grumpydevelop/singularity,xuyangcn/opalcoin,ArgonToken/ArgonToken,ahmedbodi/test2,cerebrus29301/crowncoin,grumpydevelop/singularity,ahmedbodi/test2,ArgonToken/ArgonToken,xuyangcn/opalcoin,xuyangcn/opalcoin,grumpydevelop/singularity