Update Go version to 1.16 (#160)

Author: lucacome

.github/workflows/ci.yml

@@ -23,7 +23,7 @@ on:
 
 env:
   DOCKER_BUILDKIT: 1
-  GOLANG_VERSION: 1.15
+  GOLANG_VERSION: 1.16
 
 jobs:
 
@@ -73,9 +73,9 @@ jobs:
     name: Release Image
     runs-on: ubuntu-18.04
     needs: [build, unit-tests]
-    if: 
+    if:
       github.repository == 'nginxinc/nginx-prometheus-exporter' &&
-      github.event_name == 'create' && 
+      github.event_name == 'create' &&
       contains(github.ref, 'refs/tags/')
     steps:
       - name: Checkout Repository
@@ -95,7 +95,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-buildx-
       - name: DockerHub Login
-        uses: docker/login-action@v1 
+        uses: docker/login-action@v1
         with:
           username: ${{ secrets.DOCKER_USERNAME }}
           password: ${{ secrets.DOCKER_PASSWORD }}
@@ -125,8 +125,8 @@ jobs:
           echo "::set-output name=repo::$(echo ${GITHUB_REPOSITORY} | cut -d '/' -f 2)"
       - name: Send Notification
         uses: 8398a7/action-slack@v3
-        if: 
-          steps.check.outputs.status == 'failure' || 
+        if:
+          steps.check.outputs.status == 'failure' ||
           steps.check.outputs.status == 'cancelled'
         with:
           status: custom
@@ -162,4 +162,4 @@ jobs:
             }
         env:
           GITHUB_TOKEN: ${{ github.token }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}

.github/workflows/fossa.yml

@@ -15,7 +15,7 @@ defaults:
 env:
   FOSSA_VER: 1.1.0
   FOSSA_URL: https://github.com/fossas/fossa-cli/releases/download
-  GOLANG_VERSION: 1.15
+  GOLANG_VERSION: 1.16
 
 jobs:
 
@@ -87,4 +87,4 @@ jobs:
             }
         env:
           GITHUB_TOKEN: ${{ github.token }}
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}
+          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK }}

build/Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.15 as builder
+FROM golang:1.16 as builder
 ARG VERSION
 ARG GIT_COMMIT
 WORKDIR /go/src/github.com/nginxinc/nginx-prometheus-exporter

go.mod

@@ -1,6 +1,6 @@
 module github.com/nginxinc/nginx-prometheus-exporter
 
-go 1.15
+go 1.16
 
 require (
 	github.com/nginxinc/nginx-plus-go-client v0.8.0