rolog 0.9.4

• Added a vignette with a manuscript for JSS
• Patch on swipl to suppress a deprecation warning under macOS (vfork)

rolog 0.9.3

• Added a NEWS.md file to track changes to the package.
• Temporarily remove diagrams from the package vignette because DiagrammeR is currently not available in r-devel.
• Slightly faster build on Windows