ci: add more branches

Author: illusory0x0

.github/workflows/check.yaml

@@ -9,6 +9,8 @@ on:
   push:
     branches:
       - master
+      - main
+      
   pull_request:
 
 jobs:

README.md

@@ -2,25 +2,8 @@
 
 This CI configuration was modified from [moonbitlang/core CI](https://github.com/moonbitlang/core/blob/main/.github/workflows/check.yml)
 
-## Usage
-
-Change the `master` branch to your own
-
-```yaml
-## .github\workflows\check.yaml
-name: check
-
-on:
-  push:
-    branches:
-      - master
-  pull_request:
-```
-
 ## Modified
 
-### remove 
-
 * moon bundle
 * coverage-check
 * license-header-check