README.md: add more badges

.github/workflows/test.yml

@@ -6,14 +6,14 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 3
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v2
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
         with:
-          node-version: '16'
+          node-version: '18'
       - name: Get yarn cache directory path
         id: yarn-cache-dir-path
         run: echo "::set-output name=dir::$(yarn cache dir)"
-      - uses: actions/cache@v2
+      - uses: actions/cache@v3
         id: yarn-cache # use this to check for `cache-hit` (`steps.yarn-cache.outputs.cache-hit != 'true'`)
         with:
           path: ${{ steps.yarn-cache-dir-path.outputs.dir }}

README.md

@@ -1,10 +1,13 @@
-# Math API
-
+[![Project status: active – The project has reached a stable, usable state and is being actively developed.](https://www.repostatus.org/badges/latest/active.svg)](https://www.repostatus.org/#active)
 [![workflow-badge]][workflow-url]
+[![Project contributors](https://img.shields.io/github/contributors/uetchy/math-api)](https://github.com/uetchy/math-api/graphs/contributors)
+[![Project license](https://img.shields.io/github/license/uetchy/math-api)](https://github.com/uetchy/math-api/blob/master/LICENSE)
 
 [workflow-badge]: https://github.com/uetchy/math-api/workflows/test/badge.svg
 [workflow-url]: https://github.com/uetchy/math-api/actions?workflow=test
 
+# Math API
+
 Place LaTeX Math equation on anywhere as `<img>` tag.
 
 - https://math.vercel.app