Es6ify fixes, fix build

Author: Andreas Müller

.gitignore

@@ -7,3 +7,4 @@
 yarn-error.log
 **/._*
 out
+dist

.travis.yml

@@ -1,5 +1,20 @@
 # Contributing
 
+## How to build
+
+
+git clone [email protected]:ndu2/gitlab-time-tracker.git
+
+install requirements (see documentation.md)
+
+```
+npm install
+npm run-script build
+
+
+
+
+
 ## How to test the basic functions of gtt
 
 Create a new project on GitLab if you haven't done so already and write down the project path. e.g. `kriskbx/example-project`. To test groups and subgroups, create a new group with at least one subgroup. Add a new project to both the parent group (e.g. `example-group`) and the subgroup (e.g. `example-group/example-subgroup`) and write down the paths of all the projects and groups. Create at least two issues (write down their id e.g. `42`, `43`) and one merge request (e.g. `13`) in all projects. Or just use our public group over here: https://gitlab.com/gtt

CONTRIBUTING.md

@@ -22,7 +22,7 @@
 
 ## requirements
 
-* [node.js](https://nodejs.org/en/download) version >= 6
+* [node.js](https://nodejs.org/en/download) version >= 20
 * [npm](https://github.com/npm/npm) or [yarn](https://yarnpkg.com/en/docs/install)
 
 ## installation