optimize markdown lint (#245)

.github/workflows/lint.yml

@@ -13,6 +13,10 @@ jobs:
           python-version: 3.7
       - name: Install pre-commit hook
         run: |
+          # markdownlint requires ruby >= 2.7
+          sudo apt-add-repository ppa:brightbox/ruby-ng -y
+          sudo apt-get update
+          sudo apt-get install -y ruby2.7
           pip install pre-commit
           pre-commit install
       - name: Linting

.pre-commit-config.yaml

@@ -28,8 +28,8 @@ repos:
         args: ["--remove"]
       - id: mixed-line-ending
         args: ["--fix=lf"]
-  - repo: https://github.com/jumanjihouse/pre-commit-hooks
-    rev: 2.1.4
+  - repo: https://github.com/markdownlint/markdownlint
+    rev: v0.11.0
     hooks:
       - id: markdownlint
         args: