Some repo tweaks

Author: Vovan-VE

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node-version: [12, 14, 16]
+        node-version: [18, 20]
         # Node.js release schedule at https://nodejs.org/en/about/releases/
     steps:
       - uses: actions/checkout@v2

README.md

@@ -23,6 +23,10 @@ To add new language, follow steps below:
 6.  Optional. Run tests as described below to check if everything is fine.
 7.  Commit your changes and push. Then create a PR from your fork repository.
 
+Check [`{select}`](https://formatjs.io/docs/core-concepts/icu-syntax/#select-format)
+and [`{plural}`](https://formatjs.io/docs/core-concepts/icu-syntax/#plural-format)
+syntax before editing.
+
 ## Testing
 
 If you wish or need to run tests, follow steps: