Update Go version to v1.16 (#54)

* Update Go version

* Update Go versions on the pipeline's Docker images

Author: joanlopez

.circleci/config.yml

@@ -1,16 +1,16 @@
 version: 2
 jobs:
-  build-go1.14:
+  build-go1.15:
     docker:
-      - image: circleci/golang:1.14
+      - image: circleci/golang:1.15
     working_directory: /go/src/github.com/{{ORG_NAME}}/{{REPO_NAME}}
     steps:
       - checkout
       - run: go test -v -race ./...
       - run: go build -race cmd/gopherapi/main.go
-  build-go1.15:
+  build-go1.16:
     docker:
-      - image: circleci/golang:1.15
+      - image: circleci/golang:1.16
     working_directory: /go/src/github.com/{{ORG_NAME}}/{{REPO_NAME}}
     steps:
       - checkout
@@ -28,6 +28,6 @@ workflows:
   version: 2
   build_and_test:
     jobs:
-      - build-go1.14
       - build-go1.15
+      - build-go1.16
       - build-go_latest

go.mod

@@ -14,4 +14,4 @@ require (
 	github.com/stretchr/testify v1.7.0
 )
 
-go 1.15
+go 1.16