Update CI test matrix

.github/workflows/continuous_delivery.yaml

@@ -30,10 +30,10 @@ jobs:
     steps:
     - name: Setup
       uses: actions/setup-go@v2
-      with:
-        go-version: '1.14'
+
     - name: Checkout
       uses: actions/checkout@v2
+
     - name: Lint
       run: make lint
 
@@ -43,14 +43,16 @@ jobs:
     steps:
     - name: Setup
       uses: actions/setup-go@v2
-      with:
-        go-version: '1.14'
+
     - name: Checkout
       uses: actions/checkout@v2
+
     - name: Build
       run: make build
+
     - name: Test
       run: make testci
+
     - name: Code coverage
       uses: codecov/codecov-action@v1
       with:
@@ -62,18 +64,20 @@ jobs:
     strategy:
       matrix:
         go_version:
-        - '1.11'
-        - '1.12'
         - '1.13'
+        - '1.14'
     steps:
     - name: Setup
       uses: actions/setup-go@v2
       with:
         go-version: ${{matrix.go_version}}
+
     - name: Checkout
       uses: actions/checkout@v2
+
     - name: Build
       run: make build
+
     - name: Test
       run: make test