Changes in version 1.0.0 (2019-05-24)                  

This is the first release.

  - Added a NEWS.md file to track changes to the package.
  - Added a README.md
  - The following functionalities are implemented:
      - interactionGraphs() generates an interaction graph object
      - plotIntGraph() plots an interaction graph object (in RStudio)
      - igToGrViz() exports an interaction graph object to a Graphviz
        file
      - igToSVG() exports an interaction graph object to a SVG image
      - igToPNG() exports an interaction graph object to a PNG image
      - igToPDF() exports an interaction graph object to a PDF file
      - igToPS() exports an interaction graph object to a PS
        (PostScript) file