update go.yml, circle.yml and travis.yml

Author: vcaesar

.github/workflows/go.yml

@@ -10,10 +10,10 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-      - name: Set up Go 1.15
+      - name: Set up Go 1.16
         uses: actions/setup-go@v1
         with:
-          go-version: 1.15
+          go-version: 1.16
         id: go
 
       - name: Check out code into the Go module directory

.travis.yml

@@ -9,7 +9,8 @@ go:
   # - 1.12.x
   # - 1.13.x
   # - 1.14.x
-  - 1.15.x
+  # - 1.15.x
+  - 1.16.x
   # - tip
 
 sudo: false

circle.yml

@@ -8,7 +8,7 @@ version: 2
 jobs:
   build:
     docker:
-      - image: golang:1.15.5
+      - image: golang:1.16.5
     working_directory: /gopath/src/github.com/go-ego/gpy
     steps:
       - checkout