Add linter jsonlint for json

README.md

@@ -33,6 +33,7 @@ name. That seems to be the fairest way to arrange this table.
 | Fortran | [gcc](https://gcc.gnu.org/) |
 | Haskell | [ghc](https://www.haskell.org/ghc/)^ |
 | JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/) |
+| Json | [jsonlint](http://zaa.ch/jsonlint/) |
 | Python | [flake8](http://flake8.pycqa.org/en/latest/) |
 | Ruby   | [rubocop](https://github.com/bbatsov/rubocop) |
 | Vim | [vint](https://github.com/Kuniwak/vint)^ |