tools: update eslint-plugin-markdown to 1.0.0

For eslint-plugin-markdown, we had been using an RC but can now use the most recent stable release of 1.0.0, as it has the bugfix that caused us to start using the RC in the first place. There are a few other updates in this commit too because it was performed by running `update-eslint.sh`. This did not update ESLint itself but did update some dependencies.
nodejs · Trott · Feb 28, 2019 · Feb 28, 2019 · Feb 28, 2019 · 1d61eaace6b67f0b3a0d5a9cd4e0c554454a012d
commit 1d61eaace6b67f0b3a0d5a9cd4e0c554454a012d
diff --git a/tools/node_modules/eslint/node_modules/acorn/dist/acorn.js b/tools/node_modules/eslint/node_modules/acorn/dist/acorn.js
diff --git a/tools/node_modules/eslint/node_modules/acorn/dist/acorn.js.map b/tools/node_modules/eslint/node_modules/acorn/dist/acorn.js.map
diff --git a/tools/node_modules/eslint/node_modules/acorn/dist/acorn.mjs b/tools/node_modules/eslint/node_modules/acorn/dist/acorn.mjs
diff --git a/tools/node_modules/eslint/node_modules/acorn/dist/acorn.mjs.map b/tools/node_modules/eslint/node_modules/acorn/dist/acorn.mjs.map
diff --git a/tools/node_modules/eslint/node_modules/acorn/package.json b/tools/node_modules/eslint/node_modules/acorn/package.json
diff --git a/tools/node_modules/eslint/node_modules/ajv/dist/ajv.bundle.js b/tools/node_modules/eslint/node_modules/ajv/dist/ajv.bundle.js
diff --git a/tools/node_modules/eslint/node_modules/ajv/dist/ajv.min.js b/tools/node_modules/eslint/node_modules/ajv/dist/ajv.min.js
diff --git a/tools/node_modules/eslint/node_modules/ajv/dist/ajv.min.js.map b/tools/node_modules/eslint/node_modules/ajv/dist/ajv.min.js.map
diff --git a/tools/node_modules/eslint/node_modules/ajv/lib/ajv.d.ts b/tools/node_modules/eslint/node_modules/ajv/lib/ajv.d.ts
diff --git a/tools/node_modules/eslint/node_modules/ajv/lib/ajv.js b/tools/node_modules/eslint/node_modules/ajv/lib/ajv.js
diff --git a/tools/node_modules/eslint/node_modules/ajv/lib/keyword.js b/tools/node_modules/eslint/node_modules/ajv/lib/keyword.js
diff --git a/tools/node_modules/eslint/node_modules/ajv/package.json b/tools/node_modules/eslint/node_modules/ajv/package.json
diff --git a/tools/node_modules/eslint/node_modules/ajv/scripts/prepare-tests b/tools/node_modules/eslint/node_modules/ajv/scripts/prepare-tests
diff --git a/tools/node_modules/eslint/node_modules/eslint-plugin-markdown/README.md b/tools/node_modules/eslint/node_modules/eslint-plugin-markdown/README.md
diff --git a/tools/node_modules/eslint/node_modules/eslint-plugin-markdown/package.json b/tools/node_modules/eslint/node_modules/eslint-plugin-markdown/package.json
diff --git a/tools/node_modules/eslint/node_modules/js-yaml/dist/js-yaml.js b/tools/node_modules/eslint/node_modules/js-yaml/dist/js-yaml.js
diff --git a/tools/node_modules/eslint/node_modules/js-yaml/dist/js-yaml.min.js b/tools/node_modules/eslint/node_modules/js-yaml/dist/js-yaml.min.js
diff --git a/tools/node_modules/eslint/node_modules/js-yaml/lib/js-yaml/dumper.js b/tools/node_modules/eslint/node_modules/js-yaml/lib/js-yaml/dumper.js
diff --git a/tools/node_modules/eslint/node_modules/js-yaml/package.json b/tools/node_modules/eslint/node_modules/js-yaml/package.json
diff --git a/tools/node_modules/eslint/node_modules/parse-entities/package.json b/tools/node_modules/eslint/node_modules/parse-entities/package.json