Update runtime files.

runtime/compiler/jsonlint.vim

@@ -0,0 +1,25 @@
+" Vim compiler file
+" Compiler:	JSON Lint
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2019 Jul 10
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "jsonlint"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" CompilerSet makeprg=npx\ jsonlint\ --compact\ --quiet
+
+CompilerSet makeprg=jsonlint\ --compact\ --quiet
+CompilerSet errorformat=%f:\ line\ %l\\,\ col\ %c\\,\ found:\ %m,
+		       \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save