[Dev Deps] update markdownlint, markdownlint-cli

Author: ljharb

README.md

@@ -3739,7 +3739,7 @@ Other Style Guides
     - Be cautious about stubs and mocks - they can make your tests more brittle.
     - We primarily use [`mocha`](https://www.npmjs.com/package/mocha) and [`jest`](https://www.npmjs.com/package/jest) at Airbnb. [`tape`](https://www.npmjs.com/package/tape) is also used occasionally for small, separate modules.
     - 100% test coverage is a good goal to strive for, even if it’s not always practical to reach it.
-    - Whenever you fix a bug, _write a regression test_. A bug fixed without a regression test is almost certainly going to break again in the future.
+    - Whenever you fix a bug, *write a regression test*. A bug fixed without a regression test is almost certainly going to break again in the future.
 
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package.json

@@ -40,7 +40,7 @@
   },
   "homepage": "https://github.com/airbnb/javascript",
   "devDependencies": {
-    "markdownlint": "^0.20.4",
-    "markdownlint-cli": "^0.23.2"
+    "markdownlint": "^0.26.2",
+    "markdownlint-cli": "^0.32.2"
   }
 }