ci: fix branch name (#258)

Author: aspeddro

.github/workflows/ci.yml

@@ -1,20 +1,22 @@
 name: CI
 on:
   push:
-    branches: [master]
+    branches: [main]
     paths:
       - grammar.js
       - src/**
       - test/**
       - bindings/**
       - binding.gyp
+      - .github/workflows/**
   pull_request:
     paths:
       - grammar.js
       - src/**
       - test/**
       - bindings/**
       - binding.gyp
+      - .github/workflows/**
 
 concurrency:
   group: ${{github.workflow}}-${{github.ref}}