v0.7.0

NLPModelsModifiers v0.7.0

Diff since v0.6.6

Merged pull requests:

• Add CITATION.cff (#106) (@tmigot)
• update diagonal QN models (#107) (@dpo)
• Remove automerge (#108) (@tmigot)
• bump version to 0.7.0 (#109) (@dpo)
• Update .cirrus.yml (#110) (@dpo)