0.3.6

Resolve "Show "null" children in tree"

Closes #9

See merge request jastadd/relast2uml!5

Resolve "Keep order of children"

Closes #7

See merge request jastadd/relast2uml!4

- let user activate children ordering

- also use mkdocs for pages, include ragdoc

Resolve "Optionally remove identity from nodes"

Closes #8

See merge request jastadd/relast2uml!3

- let user set label, text color and background color with generic lambda function

- run build+test on every branch
- publish with pipeline-iid only in dev
- publish normally only in master
- make pages only in master