v0.19.2

NLPModels v0.19.2

Diff since v0.19.1

Merged pull requests:

• Update CommentPR.yml (#420) (@amontoison)
• put NLPModelMeta constructor outside of struct (#424) (@paraynaud)
• Add community guidelines section in readme (#425) (@tmigot)
• v0.19.2 (#426) (@paraynaud)