v0.15.1

ParametricOptInterface v0.15.1

Diff since v0.15.0

Merged pull requests:

• Improve dual cache for parameters (#226) (@joaquimg)
• Organize access to updated_parameters (#227) (@joaquimg)
• More minor fixes (#228) (@joaquimg)
• Cleanup terms getters (#229) (@joaquimg)
• Prep for v0.15.1 (#230) (@joaquimg)