update Readme for this fork

Dependencies

• [2] CZRMAMSB clearer discription of how to run lines.love
• [3] SGMDI4TC bugfix: alignment of help screen
• [4] DXT4QTAH a few more integer coordinates
• [5] VHQCNMAR several more modules
• [6] HOSPP2AN crisp font rendering
• [*] FS2ITYYH record a known issue
• [*] ZTMRQZSW Readme

Change contents

• replacement in help.lua at line 21
  [4.7506]→[3.716:805](∅→∅)
  − love.graphics.print("* Press 'ctrl+l' to switch to drawing lines", Margin_left+30,y)
  [4.7506]

  [4.5780]
  + love.graphics.print("* Press 'ctrl+2' to switch to drawing lines", Margin_left+30,y)
• replacement in help.lua at line 78
  [4.10164]→[3.2425:2509](∅→∅)
  − love.graphics.print("* Press 'l' to switch to drawing lines", Margin_left+30,y)
  [4.10164]

  [4.7866]
  + love.graphics.print("* Press '2' to switch to drawing lines", Margin_left+30,y)
• edit in help.lua at line 81
  [4.10272]

  [4.10272]
  + love.graphics.print("* Press other digits to switch to polygons with corresponding vertices", Margin_left+30,y)

  + y = y + Line_height
• edit in README.md at line 8
  [9.71]

  [2.18]
  +

  + This fork experiments with number-based keyboard shortcuts within drawings:
• edit in README.md at line 11
  [2.19]

  [2.19]
  + * `ctrl+2` for lines,

  + * `ctrl+3` for triangles,

  + * `ctrl+4` for squares,

  + * etc.

  +

  + Also corresponding shortcuts without `ctrl+` in the middle of a stroke.

  +