ERC20 -> ERC223 upgrade contract

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Name		Name	Last commit message	Last commit date
Latest commit History 5 Commits
contracts		contracts
migrations		migrations
test		test
.gitignore		.gitignore
.solcover.js		.solcover.js
.travis.yml		.travis.yml
README.md		README.md
package-lock.json		package-lock.json
package.json		package.json
truffle-config.js		truffle-config.js
truffle.js		truffle.js

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