v0.3.1

LLSModels v0.3.1

Diff since v0.3.0

Merged pull requests:

• [AUTO] Change master to main (#19) (@abelsiqueira)
• [AUTO] Fix docs to use main (#20) (@abelsiqueira)
• update signature multiple_precision_nls (#22) (@tmigot)
• Bump NLPModels 0.18 (#23) (@tmigot)