Mod: Add GitHub syntax highlighting to README

--nt
Merge branch 'feature/gh-highlighting-in-readme' into develop

* feature/gh-highlighting-in-readme:
  Mod: Add GitHub syntax highlighting to README
Fix: Update PHP version in README

5.3 -> 5.4
Merge branch 'feature/fix-php-version-in-readme' into develop

* feature/fix-php-version-in-readme:
  Fix: Update PHP version in README