[pkg-go] Bug#961820: Update build-deps to golang-github-kr-pretty-dev

[Brian Murray]

Package: golang-github-maraino-go-mock
Version: 0.0~git20180321.4c74c43-1
Severity: normal

golang-pretty-dev is a transitional package for
golang-github-kr-pretty-dev now so the build-depends of this package
should be updated to use golang-github-kr-pretty-dev.

Additionally, while fixing this for Ubuntu I noticed there is a typo in
the Description of the package.

Description: mocking framework for the Go programming anguage

Notice there is a missing 'l' in what should be language.

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Brian Murray                                                 @ubuntu.com