Update golang workflow

Author: rosylilly

.github/workflows/test.yml

@@ -11,18 +11,27 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/setup-go@master
-        with:
-          go-version: "1.16"
-      - uses: actions/checkout@master
+      - name: Checkout
+        uses: actions/checkout@master
         with:
           fetch-depth: 1
-      - run: make test
+      - name: Detect go version
+        id: go-version
+        run: echo "::set-output name=VERSION::$(cat .go-version)"
+      - name: Setup go
+        uses: actions/setup-go@master
+        with:
+          stable: 'false'
+          go-version: ${{ steps.go-version.outputs.VERSION }}
+      - name: Run test
+        run: make test
         env:
           GOARGS: "-v -race"
           GOMAXPROCS: 8
-      - uses: codecov/codecov-action@v1
+      - name: Report coverage
+        uses: codecov/codecov-action@v1
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./tmp/cover.out
-      - run: make demo
+      - name: Run demo
+        run: make demo

.go-version

@@ -0,0 +1 @@
+1.18