Fix wrong BLAKE multihash values #22
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The multihash values for the BLAKE hash family are incorrect ‒ they do not properly encode the hash algorithm identifier, which should be a varint and not just a plain 16-bit (big endian even?) integer. As currently written, those multihashes are coincidentally well-formed, but do not point to any sensible hash algorithms.
The examples on multiformats.io are correct, so I have used them to fix the examples here.