Updated wharf-api-client-go to v1.3.1

[applejag]

• [x] I've added a new note in the CHANGELOG.md file, according to docs: https://iver-wharf.github.io/#/development/changelogs/writing-changelogs

Summary

• Ran

  $ go get github.com/iver-wharf/wharf-api-client-go@v1.3.1

• Updated some method and field names as they got renamed in wharf-api-client-go v1.2.0 → v1.3.0

• Removed empty code block, as that was a linting warning

Motivation

Keep the repos up to date, and begone with linting warnings

Before:

$ npm run lint-go

> @ lint-go /home/kalle/dev/wharf/wharf-provider-gitlab
> revive -formatter stylish -config revive.toml ./...

testdoubles/wharfclientapifetcher_mock.go
  (15, 37)  https://revive.run/r#var-naming  method GetTokenById should be GetTokenByID
  (34, 37)  https://revive.run/r#var-naming  method GetProviderById should be GetProviderByID

trigger.go
  (17, 41)  https://revive.run/r#empty-block  this block is empty, you can remove it

 ✖ 3 problems (0 errors) (3 warnings)

Now, after this PR:

$ npm run lint-go

> @ lint-go /home/kalle/dev/wharf/wharf-provider-gitlab
> revive -formatter stylish -config revive.toml ./...