[GRASS-git] [OSGeo/grass] 4a7eaa: README refactoring (#231)

[Ondrej Pesek]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: 4a7eaaa76fd0558d99244d6b7015dd3cfa51f428
      https://github.com/OSGeo/grass/commit/4a7eaaa76fd0558d99244d6b7015dd3cfa51f428
  Author: Ondrej Pesek <pesej.ondrek at gmail.com>
  Date:   2019-12-12 (Thu, 12 Dec 2019)

  Changed paths:
    M README.md

  Log Message:
  -----------
  README refactoring (#231)

Follow Markdown recommended style guides in README:

* Do not mix different header styles (minuses and hash marks were used for the same level)
* Line length = 80 characters (I ignored the code excerpts parts)
* Do not use plain URLs (use <URL> for them)
* Delete unnecessary indentation
* Surround fenced code blocks by blank lines
* Delete multiple consecutive blank lines