Add MUID

[amotl]

MUIDs (Memorable Unique Identifiers), as implemented by @microprediction at https://github.com/microprediction/muid, have some sweet properties.

Example

>>> muid.pretty(b"56a33411a3ae7cfc95597911708358ad", k1=6, k2=5)
'Shammy Llama'

[microprediction]

Oh hi. Cool package you have here!