r2stl 1.0.3

• New maintainer: Paul Northrop
• Fixed NOTEs in the CRAN package Check Results
  • Updated license from CC BY-NC-SA 3.0 to CC BY-NC-SA 4.0
  • Use markdown README file
  • Used graphics::persp() to call persp()
  • Avoided long line width in r2stl.Rd
  • Ensured that .stl files produced are not included in the package
• Created basic package home page at https://paulnorthrop.github.io/r2stl/