Relicense from Apache2.0 to CC0-1.0 (#38)

Also update binary output due to metadata change.

Agreed by all authors, including @chriseth, @MrChico, and @axic.
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// //
// //
// SPDX-License-Identifier: Apache-2.0 // SPDX-License-Identifier: CC0-1.0
pragma solidity 0.6.11; pragma solidity 0.6.11;