fix MarshalJSON undefined for non-pointer Uint160 #184

	# This workflow will build a golang project
	# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-go

	name: Build Ubuntu

	on:
	push:
	# enable next line to limit for specific branches
	# branches: [ "master" ]
	pull_request:
	# branches: [ "master" ]

	jobs:

	build-ubuntu:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3

	- name: Set up Go
	uses: actions/setup-go@v3
	with:
	go-version: 1.19

	- name: Build
	run: make

	- name: Test
	run: go test -v ./...

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