new release due to #11

(BUG) fixes #10

AuthService.RefreshAuthToken() implemented

Merge pull request #7 from prolicht-dev/fix_user_story

fix for user story unmarshalling

Merge pull request #4 from prolicht-dev/issues_dev

API functions for Issue

New: Support for easily handling custom attributes

build-and-run scripts added to contribute

update contribute/main.go

swapped to simplified init

Releasing v1.2.1

Stepping to v1.2.0