Update and rename blank.yml to macos.yml

.github/workflows/macos.yml

@@ -0,0 +1,18 @@
+name: macOS Build
+on: [push, pull_request]
+jobs:
+  build:
+    name: Test on node ${{ matrix.node_version }}
+    runs-on: macOS-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v1
+
+    - name: Installing Node
+      uses: actions/setup-node@v1
+      with:
+        version: 10
+
+    - name: Build
+      run: build/travis.sh