chore: fix github action cache.

.github/workflows/go-cross.yml

@@ -11,7 +11,7 @@ jobs:
 
     strategy:
       matrix:
-        go-version: [ 1.14, 1.15, 1.x ]
+        go-version: [ 1.15, 1.16, 1.x ]
         os: [ubuntu-latest, macos-latest, windows-latest]
 
     steps:
@@ -29,11 +29,16 @@ jobs:
       - name: Cache Go modules
         uses: actions/cache@v2
         with:
+          # In order:
+          # * Module download cache
+          # * Build cache (Linux)
+          # * Build cache (Mac)
+          # * Build cache (Windows)
           path: |
-            ~/go/pkg/mod              # Module download cache
-            ~/.cache/go-build         # Build cache (Linux)
-            ~/Library/Caches/go-build # Build cache (Mac)
-            '%LocalAppData%\go-build' # Build cache (Windows)
+            ~/go/pkg/mod
+            ~/.cache/go-build
+            ~/Library/Caches/go-build
+            %LocalAppData%\go-build
           key: ${{ runner.os }}-${{ matrix.go-version }}-go-${{ hashFiles('**/go.sum') }}
           restore-keys: |
             ${{ runner.os }}-${{ matrix.go-version }}-go-