Update to latest Go in Travis config.
Update to latest Go in Travis config.

jrick/btcwallet,decred/dcrwallet,jrick/btcwallet,btcsuite/btcwallet,synrg-labs/btcwallet,synrg-labs/btcwallet,Roasbeef/btcwallet,Stash-Crypto/btcwallet,Roasbeef/btcwallet,decred/dcrwallet,btcsuite/btcwallet,jrick/dcrwallet,jrick/dcrwallet,Stash-Crypto/btcwallet