v0.12.0

HarmonicBalance v0.12.0

Diff since v0.11.1

Merged pull requests:

• feat: Method structs (#298) (@oameye)
• feat: add `ODEProblem(::DIfferentialEquation) (#302) (@oameye)
• docs: change font to JuliaMono (#304) (@oameye)
• add Invalidations CI (#309) (@oameye)
• build: tag v0.12 (#310) (@oameye)

Closed issues:

• Make method structs (#204)