update blockreader example to use toJSON
update blockreader example to use toJSON

maraoz/coinforge,olalonde/bitcore,maraoz/coinforge,TOMOAKI12345/bitcore,janko33bd/bitcore,daxxog/clamcore,olalonde/bitcore,martindale/bitcore,genecyber/bitcore,initaldk/bitcore,iobond/bitcore,iobond/bitcore,bilthon/bitcore,martindale/fullnode,braydonf/bitcore,bitjson/bitcore,phplaboratory/bitcore,braydonf/bitcore,lekkas/bitcore,iobond/bitcore,litecoin-project/litecore,initaldk/bitcore,jcvernaleo/bitcore,eXcomm/bitcore,lekkas/bitcore,martindale/fullnode,bitpay/bitcore,TOMOAKI12345/bitcore,TeamPiggyCoin/PiggyCore,bitpay/bitcore,pnagurny/bitcore,bitjson/bitcore,MonetaryUnit/bitcore,iobond/bitcore,martindale/bitcore,bankonme/bitcore,bitjson/bitcore,bitpay/bitcore,eordano/bitcore,bitpay/bitcore,iobond/bitcore,genecyber/bitcore,bankonme/bitcore,adjoinant/bitcore,eXcomm/bitcore,litecoin-project/litecore,MonetaryUnit/bitcore,williamcotton/bitcore,UdjinM6/bitcore-dash,williamcotton/bitcore,daxxog/clamcore,ryanxcharles/fullnode,reddit/fullnode,ryanxcharles/fullnode,adjoinant/bitcore,jcvernaleo/bitcore,eordano/bitcore,janko33bd/bitcore,martindale/bitcore,bitjson/bitcore,bilthon/bitcore,GroestlCoin/groestlcore,phplaboratory/bitcore,pnagurny/bitcore,martindale/bitcore,TeamPiggyCoin/PiggyCore