Update checkpoints.cpp
Update checkpoints.cpp

Add security checkpoints.
elambert2014/CryptoBullion-CBX,cryptogenicbonds/CryptoBullion-CBX,elambert2014/CryptoBullion-CBX,cryptogenicbonds/CryptoBullion-CBX,MercStills/CryptogenicBullion,cryptogenicbonds/CryptoBullion-CBX,MercStills/CryptogenicBullion,elambert2014/CryptoBullion-CBX,MercStills/CryptogenicBullion,cryptogenicbonds/CryptoBullion-CBX,cryptogenicbonds/CryptoBullion-CBX,cryptogenicbonds/CryptoBullion-CBX,elambert2014/CryptoBullion-CBX,cryptogenicbonds/CryptoBullion-CBX,elambert2014/CryptoBullion-CBX,elambert2014/CryptoBullion-CBX,MercStills/CryptogenicBullion,MercStills/CryptogenicBullion