tools: apply more stringent blank-line linting for markdown files

Update remark-preset-lint-node to 1.9.0, which adds linting for
multiple consecutive blank lines.

PR-URL: #29447
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

Author: Trott

doc/changelogs/CHANGELOG_V10.md

@@ -53,7 +53,6 @@
   * [io.js](CHANGELOG_IOJS.md)
   * [Archive](CHANGELOG_ARCHIVE.md)
 
-
 <a id="10.15.3"></a>
 ## 2019-03-05, Version 10.15.3 'Dubnium' (LTS), @BethGriggs
 

tools/lint-md.js

@@ -9,7 +9,7 @@
     "markdown-extensions": "^1.1.1",
     "remark": "^10.0.1",
     "remark-lint": "^6.0.4",
-    "remark-preset-lint-node": "^1.8.0",
+    "remark-preset-lint-node": "^1.9.0",
     "unified-args": "^7.0.0",
     "unified-engine": "^6.0.1"
   },