Bump Go used in CI to 1.15.6 (#27)

Signed-off-by: Sunjay Bhatia <[email protected]>

.github/workflows/test.yaml

@@ -9,22 +9,19 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.14
-      uses: actions/setup-go@v1
-      with:
-        go-version: 1.14
-
     - name: Check out code into the Go module directory
       uses: actions/checkout@v2
 
-    - name: Set up PATH
-      run: 'echo "::add-path::$(go env GOPATH)/bin"'
+    - name: Set up Go
+      uses: actions/setup-go@v2
+      with:
+        go-version: 1.15.6
 
     - name: Test
       run: make check-tests
 
     - name: Lint
       run: make check-lint
-      
+
     - name: Build
       run: make build