Be consistent about Notary vs notary

[amouat]

Sorry, a bit OCD but it was getting to me :)

[GordonTheTurtle]

Please sign your commits following these rules:
https://github.com/moby/moby/blob/master/CONTRIBUTING.md#sign-your-work
The easiest way to do this is to amend the last commit:

$ git clone -b "patch-1" git@github.com:amouat/notary.git somewhere
$ cd somewhere
$ git commit --amend -s --no-edit
$ git push -f

Amending updates the existing PR. You DO NOT need to open a new one.

[docker-jenkins]

Can one of the admins verify this patch?

[HuKeping]

seems great :)

[cyli]

jenkins, test this please

[cyli]

Thanks for the changes @amouat - LGTM pending CI

[ecordell]

LGTM