Identicons in Elixir.

Add excon to your list of dependencies in mix.exs:

```elixir
def deps do
  [{:excon, "~> 4.1"}]
end
```

iex> Excon.ident("excon", filename: "excon64", magnification: 8)

iex> Excon.ident("excon", filename: "excon32", magnification: 4, type: :duotone)

iex> Excon.ident("excon", filename: "excon64", magnification: 8, type: :svg)

iex> Excon.ident("excon", filename: "excon32", magnification: 4, type: :framed)