ci: update go versions and github actions

.github/workflows/ci.yml

@@ -7,26 +7,23 @@ on:
 
 jobs:
   build:
+    runs-on: ubuntu-latest
     strategy:
       matrix:
         go:
-        - '1.11'
-        - '1.12'
         - '1.13'
-    runs-on: ubuntu-latest
+        - '1.14'
-    steps:
+        - '1.15'
-    - uses: actions/checkout@v1
-    - name: Set up Go ${{ matrix.go }}
-      uses: actions/setup-go@v1
-      with:
-        go-version: ${{ matrix.go }}
-    - name: Set up Make
-      run: |
-        sudo apt-get -y install make
-    - name: Build
     env:
       GO111MODULE: on
       GOPROXY: direct
       GOSUMDB: off
+    steps:
+    - uses: actions/checkout@v2
+    - name: Set up Go ${{ matrix.go }}
+      uses: actions/setup-go@v2
+      with:
+        go-version: ${{ matrix.go }}
+    - name: Build
       run: |
         make