fix empty pin bug

update go mod to github.com/fox-one/mixin-cli/v2

gitignore

github action

go mod

Merge pull request #5 from fox-one/feat/set-default-opponent-for-qrcode

The client id is used as default opponent if the qrcode option is set

fix[cmd/sign]: update mixin-sdk-go to support ed25519 private key

add transformer commands

update mixin-sdk-go

Support ed25519 keystore (#1)

* Fix: turn to use new mixin sdk

* Chore: ignore the built binary file