Bumps [eslint-utils](https://github.com/mysticatea/eslint-utils) from 1.3.1 to 1.4.3.
- [Release notes](https://github.com/mysticatea/eslint-utils/releases)
- [Commits](mysticatea/eslint-utils@v1.3.1...v1.4.3)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Bumps [acorn](https://github.com/acornjs/acorn) from 6.1.1 to 6.4.1.
- [Release notes](https://github.com/acornjs/acorn/releases)
- [Commits](acornjs/acorn@6.1.1...6.4.1)

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Bumps [lodash](https://github.com/lodash/lodash) from 4.17.10 to 4.17.20.
- [Release notes](https://github.com/lodash/lodash/releases)
- [Commits](lodash/lodash@4.17.10...4.17.20)

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Bumps [decompress](https://github.com/kevva/decompress) from 4.2.0 to 4.2.1.
- [Release notes](https://github.com/kevva/decompress/releases)
- [Commits](kevva/decompress@v4.2.0...v4.2.1)

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ran into this problem while using buidler to compile contracts. They don't include network in the artifact by default so this line throws. I've opened an issue on their repo to follow truffle's artifacts format by including the network key. Couldn't hurt to check for the key here anyway...

* [StorageAccessible] invokeStaticDelegatecall

* unit test for reversion on state change attempt

* compiling and test-passing upgrade to solc-6
* Update package.json
* update doc string to make return values more clear
* add SPDX-License-Identifier in all contract headers
* use LGPL-3.0-only instead of or-newer
* call same method on both receive and fallback

Co-authored-by: Nicholas Rodrigues Lordello <nlordell@gmail.com>

As per @rmeissner's suggestion in #38. This is a much more elegant way of achieving the same thing (no code duplication). Unfortunately this is an API breaking change and we already published the npm package vor v3.0.0. Maybe we can deprecate this package and republish this without a major version update?

### Test Plan

unit test still passing.