Fix TravisCI build for Go release version.
Fix TravisCI build for Go release version.

cqswxj2013/btcd,jcmincke/dcrd,btcsuite/btcd,dan-da/btcd,Dirbaio/btcd,jrick/btcd,danoctavian/btcd,Stash-Crypto/btcd,BitGo/prova,cjepson/btcd,pkothbauer/btcd,runeaune/btcd,soapboxsys/ombfullnode,jrick/dcrd,Cleawing/btcd,runeaune/btcd,qchain/btcd,Dirbaio/btcd,stevenroose/btcd,ppcsuite/ppcd-old,davecgh/btcd,mathiasrw/btcd,jongillham/btcd,adiabat/btcd,jrick/btcd,toddfries/btcd,CryptocurrencyCabal/htcd,hectorj/btcd,jongillham/btcd,1d4Nf6/btcd,tb00/btcd,aakselrod/btcd,wallclockbuilder/btcd,Roasbeef/btcd,Cleawing/btcd,glv2/ppcd,soapboxsys/ombfullnode,decred/dcrd,BitGo/prova,Dirbaio/btcd,toddfries/btcd,dajohi/btcd,Stash-Crypto/btcd,1d4Nf6/btcd,dajohi/btcd,jcmincke/dcrd,DanielKrawisz/btcd,jimmysong/btcd,ltcsuite/ltcd,hectorj/btcd,jrick/btcd,glv2/ppcd,davecgh/btcd,pkothbauer/btcd,ltcsuite/ltcd,tb00/btcd,ppcsuite/ppcd,wallclockbuilder/btcd,dajohi/btcd,dan-da/btcd,CryptocurrencyCabal/htcd,DanielKrawisz/btcd,cqswxj2013/btcd,decred/dcrd,cjepson/btcd,aakselrod/btcd,qchain/btcd,stevenroose/btcd,ppcsuite/ppcd-old,ppcsuite/ppcd,btcsuitereleases/btcd,danoctavian/btcd,jcmincke/dcrd,Roasbeef/btcd,btcsuite/btcd,adiabat/btcd,jimmysong/btcd,mathiasrw/btcd,btcsuitereleases/btcd,jrick/dcrd