Specify names for macos and linux jobs (#200)

Use interpolated matrix values to denote Xcode and Swift versions

Author: mattt

.github/workflows/ci.yml

@@ -16,6 +16,8 @@ jobs:
           - "11.7" # Swift 5.2
           - "12" # Swift 5.3
 
+    name: "macOS (Xcode ${{ matrix.xcode }})"
+
     steps:
       - name: Checkout
         uses: actions/checkout@v1
@@ -41,6 +43,8 @@ jobs:
       matrix:
         swift: ["5.3", "5.2"]
 
+    name: "Linux (Swift ${{ matrix.swift }})"
+
     container:
       image: swift:${{ matrix.swift }}