update

[thegostep]

Two changes:

• OneWayGriefing.sol now uses decimals. This means there are the following 3 ratio types:
  enum RatioType { NaN, Inf, Dec }
• Post.sol reverts if proofhash length is not 34 long

const hash = ethers.utils.sha256(ethers.utils.toUtf8Bytes('proofHash'));
const sha2_256 = "0x12"; // uint8
const bits256 = ethers.utils.hexlify(32);
const multihash = sha2_256 + bits256.substr(2) + hash.substr(2); // 0x12 + 0x20 + 0xc8a...
multihash = 0x1220c8a6fecb58509ad6757316d27f9e8c2e40ea5a0f64d215215b70310f2930ed4f