Fix edit project

PUT failed because of model using "through"

changed milestone to %Projects part I

By Jean-Baptiste on 2019-02-20T14:37:17 (imported from GitLab project)

added Doing + 1 deleted label

fix by https://git.happy-dev.fr/startinblox/djangoldp-packages/djangoldp/commit/6ff2022508b596c7078fd059a9188db7b3d76f18

By Jean-Baptiste on 2019-02-20T15:58:43 (imported from GitLab project)

added 3h of time spent at 2019-02-20

By Jean-Baptiste on 2019-02-20T15:58:43 (imported from GitLab project)

closed

By Jean-Baptiste on 2019-02-20T15:58:44 (imported from GitLab project)

removed Doing label