forgot to commit documentation for the commandline arg

Dependencies

• [2] CZRMAMSB clearer discription of how to run lines.love
• [*] FS2ITYYH record a known issue
• [*] D4FEFHQC flesh out Readme

Change contents

• edit in README.md at line 38
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  +

  + You can also configure the size of the window on the commandline. For example:

  +

  + ```sh

  + $ path/to/love path/to/lines.love -geometry 640x480+10+10 path/to/file/to/edit

  + ```
• edit in README.md at line 45
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  + The syntax of the geometry parameter is {width}x{height}+{x}+{y} which will

  + position the top-left corner of the window at co-ordinate (x,y). The geometry

  + parameter must come before the file to edit.

  +