Update checkpoints.cpp
Update checkpoints.cpp

add checkpoint
coinkeeper/2015-06-22_19-06_mazacoin,MazaCoin/MazaCoin,coinkeeper/2015-06-22_19-06_mazacoin,MazaCoin/MazaCoin,coinkeeper/2015-06-22_19-06_mazacoin,coinkeeper/2015-06-22_19-06_mazacoin,coinkeeper/2015-06-22_19-06_mazacoin,MazaCoin/MazaCoin,MazaCoin/MazaCoin,MazaCoin/MazaCoin