v0.10 checklist

[aaronrudkin]

Things to do before v0.10:

• Code: Complete Spencer design effects
• Vignette: Specifying targets
• Vignette: Convergence criteria
• Vignette: Error functions
• Vignette: Variable selection functions
• Vignette: Speed, memory, and convergence benchmarks
• Vignette: Design effects
• Tests: Design effects
• Tests: Code coverage for various convergence methods
• Examples and documentation: Design effects
• Check included data for desirable performance
• Fix vignette note in README
• Fix CODE OF CONDUCT
• News
• cran-comments.md
• Test binary package
• GitHub release