Use associated type M::Error instead of Error

[kseo]

No description provided.

[debris]

[clabot:check]

[debris]

let's wait for clabot to wake up

[ddorgan]

[clabot:check]

[parity-cla-bot]

It looks like @kseo hasn't signed our Contributor License Agreement, yet.

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[kseo]

[clabot:check]

[parity-cla-bot]

It looks like @kseo signed our Contributor License Agreement. 👍

Many thanks,

Parity Technologies CLA Bot