deprecate ruby (#591)

Author: JingweiZhang12

.circleci/config.yml

@@ -6,12 +6,6 @@ jobs:
       - image: cimg/python:3.7.4
     steps:
       - checkout
-      - run:
-          name: Install dependencies
-          command: |
-            sudo apt-add-repository ppa:brightbox/ruby-ng -y
-            sudo apt-get update
-            sudo apt-get install -y ruby2.7
       - run:
           name: Install pre-commit hook
           command: |

.github/workflows/lint.yml

@@ -17,10 +17,6 @@ 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

@@ -34,12 +34,12 @@ repos:
       - id: docformatter
         args: ["--in-place", "--wrap-descriptions", "79"]
   - repo: https://github.com/executablebooks/mdformat
-    rev: 0.7.14
+    rev: 0.7.9
     hooks:
       - id: mdformat
         args: ["--number"]
         additional_dependencies:
-          - mdformat-gfm
+          - mdformat-openmmlab
           - mdformat_frontmatter
           - linkify-it-py
   - repo: https://github.com/open-mmlab/pre-commit-hooks