[Enhancement] Add markdown linter in pre-commit hook (#643)

* [Enhancement] Skip CI when some specific files were changed

* update precommit markdown lint

* circleci precommit hook

.circleci/config.yml

@@ -9,6 +9,9 @@ jobs:
       - run:
           name: Install pre-commit hook
           command: |
+            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
       - run:

.github/workflows/lint.yml

@@ -13,6 +13,9 @@ jobs:
           python-version: 3.7
       - name: Install pre-commit hook
         run: |
+          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

@@ -33,6 +33,12 @@ repos:
         args: ["--remove"]
       - id: mixed-line-ending
         args: ["--fix=lf"]
+  - repo: https://github.com/markdownlint/markdownlint
+    rev: v0.11.0
+    hooks:
+      - id: markdownlint
+        args: ["-r", "~MD002,~MD013,~MD029,~MD033,~MD034",
+              "-t", "allow_different_nesting"]
   - repo: https://github.com/myint/docformatter
     rev: v1.3.1
     hooks: