Implement GoCrypto integration#572

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matejhocevar wants to merge 4 commits intoBitcoin-com:masterfrom

Eligma:gocrypto-integration

Commits on Aug 30, 2019

Implemented GoCrypto integration
Matej Hočevar
committed
Updated GoCrypto sticker URL
Matej Hočevar
committed

Commits on Oct 14, 2019

Improve error messages
Matej Hočevar
committed
Improve more error messages
Matej Hočevar
committed