rspec.yml in excavate-0.2.4

- old
+ new

@@ -1,9 +1,9 @@
 name: rspec
 
 on:
   push:
-    branches: [ master ]
+    branches: [ master, main ]
   pull_request:
 
 jobs:
   build:
     name: Test on Ruby ${{ matrix.ruby }} ${{ matrix.os }}