add contributors
add contributors

...copied from bitcore. Should also add bitcoinjs-lib contributors.

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