github: require go1.16

Author: changkun

.github/workflows/mainthread.yml

@@ -12,18 +12,12 @@ jobs:
     runs-on: ubuntu-latest
     steps:
 
-    - name: Set up Go 1.x
-      uses: actions/setup-go@v2
+    - uses: actions/checkout@v2
+    - uses: actions/setup-go@v2
       with:
-        go-version: ^1.13
-      id: go
+        stable: 'false'
+        go-version: '1.16.0'
 
-    - name: Check out code into the Go module directory
-      uses: actions/checkout@v2
-
-    - name: Get dependencies
-      run: |
-        go get -v -t -d ./...
     - name: Test
       run: |
-        go test -v -coverprofile=coverage.txt -covermode=atomic ./...
+        go test -v -covermode=atomic ./...

go.mod

@@ -1,5 +1,5 @@
 module golang.design/x/mainthread
 
-go 1.15
+go 1.16
 
 require golang.org/x/sys v0.0.0-20201022201747-fb209a7c41cd