Change branch to master

.github/workflows/rust.yaml

@@ -2,9 +2,9 @@ name: Rust build and test
 
 on:
   push:
-    branches: [ unit-tests ]
+    branches: [ master ]
   pull_request:
-    branches: [ unit-tests ]
+    branches: [ master ]
 
 env:
   CARGO_TERM_COLOR: always
@@ -30,4 +30,4 @@ jobs:
       - name: Run cargo test
         uses: actions-rs/cargo@v1
         with:
-          command: test
+          command: test